BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 11. N:o 16. 43 
subterminal. The second pair fixed at the under-side of the 
head, angularly folded (5) or reduced (9). Mandibles with 
palp. Femora of fifth and sixth pairs of pereiopoda trans- 
formed into imperfect opercula. Seventh pair not transformed. 
Gen. 1. THYROPUS, Dansa, 1852. 
United States Exploring Expedition. Crustacea. Vol. 2, p. 1012. 
1. Th. diaphanus, Dansa, 1852. 
I; te. nprLOLST pl. 6OReN AE 
Hab: Tropical parts of Atlantic. 
2.0Lh; spheroma,; CrLavs, 1879; 
>Die Gattungen und Arten du Platysceliden.s» Arb. aus dem Zool. 
Inst. der Univ. Wien und der Zool. Station in Triest. Tom. 2, p. 163 
(AT): 
Hab. Zanzibar, Ombaai Strait. 
3. Th. atlanticus, n. sp. 
Diagn. Lower produced part of the head rounded. Last 
joint of second pair of antenn&e nearly as long as the pre- 
ceding joint. Carpi and metacarpi of first two pairs of 
pereiopoda not elongated, comparatively broad; dactyli equalling 
a third of the length of metacarpi. Exterior ramus of last 
pair of uropoda half as long as the interior. 
Hab. Atlantic. 
Gen. 2. PARASCELUS, Cravus, 1879. 
»Die Gattungen und Arten der Platysceliden.> Arb. aus dem Zool. 
Inst. der Univ. Wien und der Zool. Station in Triest. Tom. 2, p. 16i 
(18). 
13CP. Edwardsi, Cravus, 1879. 
I; 6:24 164 (18); 
Hab. Atlantic. 
