Boone, Crustacea, Cruise of "Alva," 1931 95 



The ventral surface of the male, between the fifth pair of legs, 

 bears a strong, median longitudinal ridge, on either side of which 

 there is a sulcus, bounded externally by a curiously thickened, 

 elongate plate, rounded on the posterior and anterior margins 

 and with the inner surface transversed by a deep curved groove, 

 accentuated by thick-ridged margins. Between the fourth pair of 

 legs is a transverse bar posteriorly from which arises a distinct 

 median longitudinal short ridge, distally subacute. 



The female thelycum is located principally between the fifth 

 pair of legs, is composed of two plates, which together form a 

 large, circular pad, each half having the straight inner margin 

 bent downward, rim-like, on the ventral surface; a moderate 

 median ridge or tooth occurs on the ventral line, separating the 

 two halves anteriorly and forming a small, rounded plate be- 

 tween the bases of the fourth pair of legs in the median area. 

 Anterior to this plate there is a small depression and the third pair 

 of legs each bears a longitudinal, sulcated lamina, arising from 

 the proximal inner face of the basis. 



References : Peneus indicus, Edwards, H. M., Hist. Nat. Crust., 

 t. II, 1837, p. 415.— Dana, J. D., U. S. Explor. Exped., XIII, 

 Crust., pt. 1, 1852, p. 604. — Heller, C, Reise Osterreich. 

 Fregatte "Novara," Zool., Th. II, Abth. Ill, Crust., 1865, p. 

 122. — HiLGENDORF, F., Monatsb. K. Preuss. Akad. Wiss. Ber- 

 lin, 1878, p. 844.— MiERS, E. J., Proc. Zool. Soc. London, 

 1878, p. 301.— Bate, C. S., Ann. Mag. Nat. Hist., ser. 5, 

 vol. VIII, 1881, p. 177, illus. 12, fig. 5 ; Rept. H. M. S. "Chal- 

 lenger," Zool, vol. XXIV, pt. 1, 1888, p. 248, and pt. 2, 

 pi. 33, fig. 2.— DE Man, J. G., in Weber, Zool. Ergebn. Nie- 

 derl. Ost.-Ind., vol. II, 1892, p. 511, pi. 39, fig. 53; Zool. 

 Jahrb. Syst., Bd. X, 1898, p. 680. — Henderson, J. R., Trans. 

 Linn. Soc. London, Zool., ser. 2, vol. V, 1893, p. 447. — Ort- 

 mann, a., in Semon, Zool. Forschungsr. Austral. (Jena Denk- 

 sch., Bd. VIII) Crust., 1894, p. 10.— Lanchester, W. F., 

 Ann. Mag. Nat. Hist., ser. 7, vol. VI, 1900, p. 263.— NOBILI, 

 G., Ann. P,Ius. Genova, ser. 2, vol. XX, 1900, p. 474; Boll. 

 Mus. Torino, vol. XVI, no. 397, 1901, p. 2; Ibid., vol. XVIII, 

 1903, no. 447, p. 1, no. 452, p. 2, no. 455, p. 2; Ann. Sci. Nat. 

 Paris, ser. 9, t. IV, 1906, p. 7. — Pearson, J., Rept., Ceylon 

 A., Cat. Indian Decapod. Crust., pt. 3, Macrura, fasc. 1, 



