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Show 76 ZOOLOGICAL C O L L E C T I O N S M A D E D U R I N G [Jan. 4, whole surface of the segments. The first and the second postabdominal segments are similarly ridged, but firmly united together; the terminal portion (formed of the coalescent remaining segments) is ovoid, more closely and distinctly granulated than the rest of the body, and terminates in two acute spines. The eyes are placed in the lateral margins of the head. Antennules very small. Antennae a little longer than the body, with the last two joints of the peduncle about equal; flagellum short, 9-jointed, the first joint as long as the three following. The inferior margins of the last three joints of the first to fourth pairs of legs (which increase successively in length) are clothed with long close hairs. The dactyli of the fifth to seventh legs are strong and slightly arcuated. The operculiform posterior pair of postabdominal appendages are granulated on their outer surface. Length 1 inch (exclusive of antennae). A single female was obtained, at a depth of 30 fathoms, in Trinidad Channel, on a sandy bottom. This beautiful species is at once distinguished by the strongly granulated body and the spines of the last postabdominal segment. On account of the extreme brevity of the fourth segment of the body, it would be placed in the subgenus Leachia were the character valid even as a specific distinction ; but the Rev. T. R. R. Stebbing (Ann. & Mag. Nat. Hist. ser. 4, xv. p. 187, 1875) has pointed out that in the case of Arcturus lineatus this segment, which is elongated in the adult, is shorter in the young individual; there can be no doubt therefore that Arcturus and Leachia must be united. SEROUS SCYTHEI. Serolis scythei, Liitken, Naturhist. Vidensk. Medelelser, p. 98, pi. i. A. figs. 12, 13 (1858) ; Grube, Arch, f Naturg. xli. pp. 209, 220, pi. v. fig. 1. pi. vi. fig. 1 (1875). Two males were obtained in Trinidad Channel, Straits of Magellan, at 30 fathoms ; and an adult female with ova, together with eight smaller individuals, in 4 fathoms, at the same locality. It is very nearly allied to S. paradoxa, Fabr. {S. fabricii, Leach), which I have regarded as identical with $. orbignyana, M.-Edwards, and which is very common at the Magellan Straits and Falklauds- but appears to be constantly distinguished by the much greater length of the coxae, which in the second postabdominal segment reach nearly to the end of the terminal segment. ISOPODA. IDOTEA ANNULATA ? iLdotea annulata, Dana, Crust. U.S. Explor. Exped. xiv. p. 701, pi. xlvi. fig. 3 (1853); Cunningham, I. c. p. 499 (1871). To this species I refer, with some hesitation, four specimens collected at Port Henry. They are of a uniform chestnut-brown colour ; the anterior margin of the head is straight or very slightly excavated ; the eyes are rather prominent, and situated on the sides |