92 BULUETIN 129, UNITED STATES NATIONAL MUSEUM 



Genus AEPINUS Rathbun 



A'pocremmis A. Milne Edwards, Crust. R4g. Mex., 1878, p. 184; type, A. 

 septe7nspinosus A. Milne Edwards. Name Apocremnus preoccupied by 

 Fieber, Wien Ent. Monschr., vol. 2, 1858, p. 320, for a genus of Hemip- 

 tera. — Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 188. 



Aepinus Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, p. 163; 

 substituted for Apocremnus. 



Carapace triangular, or pyriform, wide behind, narrow in inter- 

 orbital region. Rostrum short, bifid. A strong supraocular spine 

 and postocular tooth or spine which is close to the eye." Basal 

 antennal article narrow, its antero-external angle forming a strong 

 spine visible from above on either side of rostrum; remaining articles 

 also visible. The maxillipeds completely close the buccal cavity, 

 the ischium increases in width distally, the merus is as wide as or 

 wider than the ischium. Chelipeds not much enlarged. Ambulatory 

 legs short and slender, propodites distally thickened, dactyls capable 

 of flexion against them. 



In the male the last two abdominal segments are fused; in the 

 female the last three are typically fused. (In A. indicus they appear 

 to be all separate.) 



Contains only two species, one on the Atlantic coast of middle 

 America, the other in the Indian Ocean. Depth, 7 to 100 fathoms. 



AEPINUS SEPTEMSPINOSUS (A. Milne Edwards) 



Plate 32, figs. 3 and 4; plate 219, figs. 1-3 



Apocremnus septemspinosus A. Milne Edwards, Crust. R^g. Mex., 1879, 

 p. 185, pi. 35, figs. 5-5d (type-locality, Florida Strait, lat. 24° 55' N., 

 long. 83° 25' W., 37 fathoms; type. Cat. No. 2882, M. C. Z.); Bull. Mus. 

 Comp. Zool., vol. 8, 1880, p. 7. — Miers, Challenger Rept., Zool., vol. 17, 

 1886, p. 17. 



Aepinus septemspinosus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, 

 vol. 4, 1898, p. 254; Bull. U. S. Fish Comm., vol. 20, for 1900, part 2 

 (1901), p. 54. 



Diagnosis. — Rostral projections lobiform. Seven dorsal capitate 

 spines. A postocular tooth. 



Description. — The carapace and feet bear a few hooked hairs; 

 carapace punctate. The seven capitate spines from which the species 

 takes its name are situated on gastric, cardiac, and branchial regions, 

 these four spines being large and subequal; on the first abdominal 

 segment, spine shorter and directed obliquely backward; and on the 

 orbital arches, spines considerably smaller. Gastric region narrow 

 and high; in front of spine there are a few tubercles and, on the 

 outer slope, a triangular laminate projection with an acute tip. A 



" There is a small but distinct spine in A. indicus Alcock, Journ. Asiat. Soc. Bengal, vol. 04, 1895, pi. 4, 

 fig. 2a, and Illus. Zool. Investigator, Crust., pt. 4, 1896, pi. 20, fig. la. 



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