EEPOET ON THE PHYLLOCARIDA. 21 



trace of spines or bristles. The young, when fully develoi^ed and ready to escape from 

 the incubatory cavity of the mother, have much the same appearance as the adult animal, 

 with this exception, however, that the last pair of pleopoda, as is also the case in the 

 young of Nehalia, are not yet developed, but only indicated as a slight projection of 

 the last segment of the pleon. 



Habitat. — According to the statement of the late Dr. v. Willemoes Suhm, the present 

 interesting form was obtained during the stay of the Expedition at the Bermudas, by 

 Mr. John Murray, who took it in Harrington Sound, a bay which only communicates 

 with the sea through a narrow passage. Afterwards the late Dr. v. Willemoes Suhm 

 also collected the animal in the same bay, where it occurred not rarely under stones and 

 Corals. But among twenty females he only succeeded in finding two male specimens. 



Nebaliopsis, n. gen. 



Generic Characters. — Carapace distinctly sculptured, very large and produced along 

 the dorsal line so as to cover over the whole trunk and the greater part of the pleon ; 

 valves not expanded posteriorly nor separated above by any f.margination. Rostral plate 

 very small, tongue-shaped. Trunk much larger than pleon and rather dilated. Tail very 

 small with the segments subec[ual. Eyes rudimentary, without pigment or visual 

 elements. Antennulse not very strong, last joint of peduncle produced anteriorly to a 

 narrow projection, terminal lamella comparatively small, narrowed at the tip, with 

 scattered spines at the edge, flagellum well developed. Antennfe with last joint of 

 peduncle divided into two segments, flagellum slender, multiarticulate. Mandibular palp 

 very strong, subpediform. Second pair of maxiUas with palp and exognath imperfectly 

 developed and not defined from basal part. Branchial legs very small and simple in 

 structure, forming oblong lanceolate lamellae, setose on the inner edge and slightly 

 lobular at the outer, eudopodal and exopodal parts only very faintly indicated, epipodite 

 distinctly defined, narrow, elliptical, upper extremity more produced than lower. Pleopoda 

 well developed, outer branch lamellar, expanded, inner lanceolate. The two succeeding 

 pairs of rudimentary caudal limbs subequal, uniarticulate. Caudal rami lamellar expanded, 

 outer edge spinous, inner setose. 



Remarks. — The present new genus is chiefly distinguished by the peculiar form and 

 sculpture of the carapace, and by the structure of the branchial legs. In both these 

 respects, as also, it would seem, in the structure of the oral parts, it difi"ers very consider- 

 ably from the two other known genera of recent Phyllocarida. The relative development 

 of the several divisions of the body is likewise rather difierent, especially when compared 

 with the typical genus Nehalia, the trunk occupying the far greater part of the l^ody, 

 whereas the terminal part or tail — greatly developed in Nehalia — is very much reduced 

 in size. In the form of the carapace, the present genus shows a certain resemblance to 



