PARASITIC CRUSTACEA FROM BIMINI — PEARSE 371 



as long, and triangular. Occludent margin straighter than the 

 carinal. 



Scutum calcified in two segments ; occludent segment thin, wider 

 than the carinal, bent at an angle of less than 90°, carinal segment 

 slender and gradually curved, flattened a little where it meets the 

 occludent. Tergum large, slightly bifid at the proximal end, with 

 a strong, recurved hook near its distal end; this hook about one- 

 fourth as long as the tergum. Carina tapered and curved distally ; 

 proximal edge rather straight. Peduncle less than half as long 

 as capitulum, nodulose and spreading proximally. 



Measurements: Length 3.2-3.8 mm.; width of capitulum 1.6- 

 2.0 mm. ; length of capitulum 2.00-2.4 mm. ; length of stalk 1.2 mm. 



Ti/pe.— U.S.N.M. No. 88580. 



Host. — From the gill chambers of 186 mud crabs Panopeus 

 herbstii H. Milne-Edwards, 32 of these parasites were collected. 

 Some of these bore ovate eggs. 



Remarks. — This species resembles O. geryonophila Pilsbry 

 (1907) and 0. mulleri (Coker (1902)), but it differs from them 

 in having a shorter peduncle, a longer and stouter hook, and a 

 bifid proximal end on the tergum. Also the actual segments come 

 close together and even overlap, proximally, in the present species. 



LITERATURE CITED 



Bassett-Smith, p. W. 



1898a. New parasitic copepods found on fish at Bombay. Ann. Mag. Nat. 



Hist., ser. 7, vol. 1, pp. 1-17. 

 1898b. Some new or rare parasitic copepods found on fish in the Indo- 



Tropic Region. Ann. Mag. Nat. Hist., ser. 7, vol. 2, pp. 357-372. 

 1899. A systematic description of parasitic copepoda found on fishes, 



with an enumeration of known species. Proc. Zool. Soc. London, 



1899, pp. 438-507. 

 Bere, Ruby. 



1936. Parasitic copepods from Gulf of Mexico fish. Amer. Midi. Nat., 



vol. 17, pp. 577-625. 



BURMEISTER, C. H. C. 



1833. Beschreibung einiger neuen oder wenig bekannten Schmarotzer- 

 krebse. Acta Acad. Caes. Leop. Carol. Nat. Cut., vol. 17, pp. 271- 

 336. 



COKER, R. E. 



1902. Notes on a species of barnacle (Dichelaspis) parasitic on the gills 

 of edible crabs. Bull. U. S. Fish. Comm., vol. 21, pp. 401-412. 

 Darwin, Charles. 



1851. A monograph on the sub-class Cirripedia: The Lepadidae, xii -f- 

 400 pp., London. 

 Heller, C. 



1868. Reise der Osterreichischen Fregatta Novara um die Erde in den 

 Jahren 1857, 1858, 1859. Zoologischer Theil, vol. 2, pb. 3, Crusta- 

 ceen, pp. 1-280. Wien. 



