194 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



ROCINELA INSULARIS Schicedte and Meinert. 



Rocinela insularis Scina«;DTE and Meinert, Naturhistorisk Tidsskrift (3), XII, 

 1879-80, pp. 390-39], pi. xii, figs. 1-3.— Richardson, Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 523. 



Lot'ol'dleH. — West Indies; between Delta of the Mississippi and Cedar 

 Keys, Florida; off Fernandina, Florida. 

 Depth. —227-273 fathoms. 



Body ol)long-ovate, al)out two and a half times longer than Avide, 10 

 mm.: 25 mm. 



Head, two and a half times wider than long, 2 mm.: 5 mm.; tri- 

 angular in shape, the front produced over 

 ^ the basal articles of the antenna?. Eyes 



large, composite, oval, and occupying a large 



part of the dorsal surface of the head, being 



xery close together 



in front, but not 



contiguous. Basal 



article of tirst an- 

 tenna small and 



almost entirely 



concealed by the 



front of the head; 



second article twice 



as long as first; 



third article nearly 



twice as long as 



second. Flagellum 



is composed of six 

 articles. The tirst pair of antennie extend to the end of the peduncle 

 of the second antenn.v, or to the antero-lateral angle of the tirst tho- 

 racic segment. The second pair of antenna' have the first two articles 

 short, the tirst article a little longer than the second; the third is twice 

 as long as the tirst; the fourth is but little longer than the third; the 

 fifth is one and a half times longer than the fourth. The flagellum is 

 composed of fifteen articles. The second antenna^ extend to the pos- 

 terior margin of the second thoracic segment. The frontal lamina is 

 small and almost inconspicuous. It is rhomboid-shaped at the base 

 and ventrally placed. The maxilliped has a palp of two articles. 



The first three segments of the thorax are subequal; the fourth 

 is slightl}' longer than any of the preceding* ones; the last three 

 are the largest. The epimera are distinct from the segments. They 

 are narrow plates, with the posterior extremities very acute in the 

 last four. The first two have the posterior extremities rounded. 

 The epimera of the seventh segment are produced beyond the poste- 



Fici. 179. — Rocinela insulaeis 

 (After Schicedte ,\nd Mein- 

 ert). a, Frontal margin 



WITH BOTH PAIRS OF ANTENN.E 

 AND FRONTAL LAMINA, h, ADULT 



MALE. (Enlarged.) 



Fiii. 180.— Rocinela insularis. 

 «, Second leg. x Hi. b, Max- 

 illiped. X 20^. 



