26 DR. R. V. WILLEMOES-SUHM ON SOME ATLANTIC 



mentioned as occurring in the same. Now we have found in the Atlantic not only four 

 specimens of Cystisoma, but also numerous specimens of two species of Oxycephalic, one 

 of which seems to me to he identical with O. piscator. 



III. On a Nsbalia prom the Bermudas. (Plate VI.) 



During our stay in the Bermudas Mr. Murray collected one day some small Crustacea 

 in Harrington Sound, a bay which only communicates with the sea through a narrow 

 passage. Among them I was very glad to find a Nebalia, and went then myself to the 

 bay, where this interesting little Crustacean was not rare under stones and corals. I 

 collected, perhaps, twenty females and two males, and was able to make some observa- 

 tions on them which, added to the embryological researches of Mecznikoff and the 

 anatomical remarks of Claus* on both sexes of the Mediterranean N Geoffroyi, will, I 

 think, enlarge somewhat our knowledge of these Crustacea, which for such a long time 

 have been considered to be Phyllopods, but, according to the above-named papers, are 

 more rightly placed among the Schizopods. 



The female of this Nebalia, which I am going to call N. longipes, has a length of 

 6 millims., and is, when living, of a milk-white colour. The shell, posteriorly and above 

 somewhat flattened, has an oval form ; it terminates anteriorly in a sharp and slender 

 rostrum, which covers the pedunculated eyes; the upper surfaces of these eyes are entirely 

 covered with small spines, so that the perception of the light is only possible through 

 the facets of the under surface. The shell does not quite extend so far backwards as in 

 N. Geoffroyi, where it reaches the fifth, abdominal segment. 



The anterior antennae (figs. 1, 2, a, and fig. 5) consist of four joints, the last of which is 

 a denticulated claw (fig. 5, k), Prom the base of this claw start two flagella (fig. 5, a and 

 b), the shorter of which is transformed into a large squamiform appendage, fringed with 

 hairs ; the other one is more slender and densely covered with olfactory hairs. 



The posterior antennce (fig. 7) consist of three joints only, the last of which is densely 

 covered on its protuberances with tufts of hairs, especially at the point of insertion of the 

 flagellum, which itself is divided into nine imperfect joints marked by tufts of hair. 



A comparison of the manclibula and the two maxillce (figs. 8-10) with the corresponding 

 parts in N. Geoffroyi shows that there are only very slight differences between them. I 

 saw the palpus of the first maxilla (" Putzfuss," Claus) in the same position in the male 

 as. in the female, i. e. bent backwards. 



More important are the pectoral feet ; for on their account especially Nebalia was 

 formerly supposed to be a true Phyllopod. If this Bermudan species had been the first 

 Nebalia which had been noticed, I do not think that this would have occurred ; for in the 

 feet of this one the phyllopodal characters are very little perceptible. In fig. 3 I have 

 figured a pectoral foot of N. longipes, and in fig. 4, for comparison, one of N. Geoffroyi 

 (taken from Claus's paper) ; so that the corresponding parts will be easily found out. 

 The two-eared branchial appendage of the basal joint (figs. 3 & 4, k a) is very large in N. 

 Geoffroyi, and in N. longipes only rudimentary. The appendage of the second joint has 

 * Von Siebold unci Kolliker's Zeitschrift fiir wissenschaftliche Zoologie. vol. xxii. p. 323. 



