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Show 74 ZOOLOGICAL COLLECTIONS MADE DURING [Jail. 4, laden with ova in an advanced stage, in Trinidad Channel; and adult male and female at Borja Bay, in 14 fathoms. In these specimens the larger hand is somewhat slenderer and the fingers less incurved than in Dana's figure: and it is worthy of note that the hand is nearly as much developed and the tubercles of the fingers are as large in the female as in the examples I believe to be males. The specimens referred to A. scabrodigitus by Dr. Cunningham differ even more markedly from Dana's figure in the much longer, slenderer hand and the entire absence of tubercles on the inner margins of the fingers, and, it is very possible, may belong to a distinct species; they are, moreover, of much larger size. ALPHEUS, sp. A specimen of an Alpheus was obtained at Portland Bay, at a depth of 10 fathoms, on a bottom of hard sand, which I will not regard as the type of a distinct species, on account of its small size. It appears to belong to the same section of the genus and to be nearly allied to A. euchirus, Dana. Like it, the orbits are spinuliferous, and the upper and lower margins of the larger hand are notched; the smaller hand is also notched on its upper and lower margins, and the dactylus is flattened, ovate, and clothed with long hairs; there is a spine at the distal end of the third (but not the second) joint of the third and fourth pairs of legs. PANDALUS PAUCIDENS, sp. n. (Plate VII. figs. 6, 7.) Carapace with a prominent antennal and a very small pterygo-stomian spine. Rostrum slender, slightly longer than the antennal scale, about |~toothed ; four of the dorsal teeth are on the carapace in a median series ; the distal end of the rostrum is directed upward, and is without teeth on its upper margin. Antennules considerably longer than the rostrum. The postabdomen is strongly geniculated beyond the third segment, which is unarmed on its dorsal surface. The terminal segment in one specimen is broader, and its apex is imperfect ; in the other it is very narrow and elongated, reaching nearly to the end of the slender and narrow uropoda, and is tipped with four cilia at its extremity. The outer masillipedes (in the larger individual) are robust, and reach (when thrown forward) slightly beyond the antennal scale ; their terminal joints are slightly hairy. The styliform terminal joints of the first legs are very slender and acute. The rami of the uropoda are margined with long ciliae, and are rounded at their distal ends ; the outer ramus is rather the broader, with the sides parallel, the inner has the sides slightly convergent to the apex. Length of larger specimen to end of rostrum rather more than li inch. Two individuals, apparently males, were collected :-one at Tom Bay, on a bottom of rock, kelp, and mud ; the other in Trinidad Channel, in 30 fathoms, on a sandy bottom. This species is principally distinguished by the small number of teeth arming the margins of the rostrum. In the P. j)ubescentulus, |