Classification of the Thalassinidea. 547 
legs of the third pair, the endopodite of the last limb 
narrow and pointed or rounded at the end, and the telson as 
broad as or broader than it is long, distinctly shorter than 
the endopodites of the last pair of limbs.’’ 
Species : 
Type. C. major, Say, 1817. Journ. Ac. Philadelphia, i. E. 
C. laticauda, Otto, 1828. Nov. Act. Leop. Carol. xiv. A, B. 
C. mucronata, Strahl, 1862. Mon.-Ber. Ak. Berlin, 1861. I. 
C. Turnerana, White, 1861. P.Z.S. C. 
C. tridentata, Martens, 1869. Mon.-Ber. Ak. Berlin, 1868. I. 
C. armata, A. M.-Edw., 1870. Nouy. Arch. Mus. vi. I. 
C. brevicaudata, A. M.-Edw., 1870. _,, 3 IE 
C. longiventris, A. M.-Eidw., 1870. __,, of Ie 
C. Bocourti, A. M.-Edw., 1870, rf r I; 
C. madagassa, Long & Richters, 1882. Abh. senck. Ges, I. 
C. Martenst, Miers, 1884. P. Z. 8. I. 
C. nove-guinee, Thallwitz, 1890. Abh. Mus. Dresden. I. 
C. diademata, Ortm., 1891. Zool. Jahrb. vi. Syst. C. 
C. Grandidieri, Coutiére, 1899. Bull. Mus. Paris. I. 
C. nove-britannia, Borradaile, 1900. Willey’s Zool. Results, iv. I. 
C. marginata, Rathbun, 1900. Bull. U.S. Fish Comm. E. 
C. Kraussi, Stebbing, 1900. South African Crust. i. S. 
C. affints, Holmes, 1900. Pap. Calif. Acad. vii. H. 
C. Stebbingi*, nom. nov. [=C. subterranea, auct.] A, B. 
Subgenus ScALxasis, Bate, 1888. 
Definition: ‘‘ Species of Callianassa with the eyes rounded, 
bearing the cornea at the end, the maxillipeds of the third 
pair fairly broad, the endopodites of the last pair of limbs 
narrow, rounded at the end, and the telson about as broad 
as long, almost as long as the last pair of limbs.” 
Species : 
Type. C. amboine (Bate), 1888. I. 
The shape of the eyes is not, I think, a primitive feature 
in this species, but it must, for the present at least, remain 
in a separate subgenus. ‘The third to fifth abdominal limbs 
are narrower than is common in Callianassa, and somewhat 
recall Callianidea. Bate’s statements respecting the gills in 
this subgenus and in Cheramus are unreliable. The speci- 
mens are now much damaged, but each had probably nine 
pairs of gills (arthrobranchs). The third pair of maxillipeds 
are broader in Scallasis than this author implies. 
* Named after Mr. Stebbing, who has shown [Hist. Crust. p. 184 
(1893)]| that Leach’s species is distinct from the form usually called 
C. subterranea, Details of the latter and of C. daticauda are given by 
Giard and Bonnier (Bull. Sci. Fr. Belg. xxii. p. 362), and it is probably 
the species figured by H. Milne-Edwards in the great illustrated edition 
of Cuvier’s ‘ Régne Animal.’ 
