OCR Text |
Show 1885.] DURING THE VOYAGE OF H.M.S. 'CHALLENGER.' 919 2. EURYCOPE SARSII, n. sp. This is one of the largest species of the genus, and was dredged at two stations between Prince Edward's Island and the Crozets. The length of the largest individual is 24 millim. The head is about equal in size to any of the anterior segments of the thorax. The first four segments of the thorax are of about the same antero-posterior diameter, the fourth being, if anything, rather narrower than the rest; the lateral diameters of these segments progressively increase, so that the fourth is the widest. The upper surface of these segments, as of the body generally, is utterly devoid of spines or tubercles which are often found in this genus ; the first four thoracic segments are concave dorsally, the rest convex ; the lateral margins of the terga, as well as of the epimera in the anterior segments of the body, are prolonged into a short forwardly directed spine. Of the posterior thoracic segments the lateral margins are prolonged into a flattened spine; this is also the case with the antero-lateral margins of the abdominal segment. The abdominal segment is bent down at its extremity ; as in E. nova-zealandia and other species the surface is divided into two lateral and a median convex area by shallow furrows ; there are no lateral processes as in other species, nor is the extremity prolonged but is abruptly truncated. The antennae and thoracic appendages were all lost. The mandibles are furnished with a three-jointed palp, the last joint set transversely and somewhat clawed ; the mandible terminates in a number of stiff tooth-like processes, below there is a tuft of slender hairs; the molar process is long and beset with fine hairs. The uropoda are minute and biramose. Station 146, 1375 fathoms; Station 147, 1600 fathoms. 3. EURYCOPE INTERMEDIA, n. sp. This small species is represented by a single individual, 9 millim. in length. The anterior margin of the head is prolonged into a short rostrum, which is bifid at its tip. The first four segments of the thorax are subequal in length, they are excavated above ; in the dorsal median line of all these segments is a short spine ; the lateral margins of these segments with the possible exception of the fourth, are not prolonged into spines ; but the epimera are so prolonged. The three posterior segments of the thorax have each a pair of short spines, one on either side of the dorsal median line. The shape of the abdominal segment readily serves to distinguish this species from any of its allies ; as in E.fragilis the abdominal segment is notched on either side and front; beyond the notch is a short transverse process which overlies the uropoda ; the terminal extremity is smooth and rounded off, and not prolonged into a spine. Station 252, 2740 fathoms. 4. EURYCOPE ATLANTICA, n. sp. This species is represented by a single specimen dredged in the North Atlantic. The specimen measured 10 millim. |