48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



overhanging articulation of distal segment; distal segment of exopod 

 smooth mesially, distolateral setae present; endopod slender, sinuous, 

 most of inner margin smooth, lacking setae, 4-5 small, proximal 

 setae present; distolateral margins of endopod with normal comple- 

 ment of setae; inner spine of basal prolongation slenderer and shorter 

 than outer. 



Color. — Traces of dark chromatophores present across posterior 

 third of carapace, sixth thoracic somite, and first, third, fourth, and 

 fifth abdominal somites, pattern most visible on first abdominal 

 somite; telson with dark spots along anterior margin. 



Size. — Female, TL 26.7. Other measurements: carapace length 

 5.2; fifth abdominal somite width 4.5; telson length 3.1, width 3.5. 



Discussion. — G. bicarinatus closely resembles G. demanii Hender- 

 son and G. hendersoni Manning in the reduction of setae on the inner 

 portions of the uropod but differs from both of these and other species 

 of the genus in having two ventral carinae on each submedian tooth 

 as well as a short, median postanal keel. As in G. demanii, a few proxi- 

 mal setae are present on the inner margin of the endopod in the 

 new species. The carinate submedian teeth of the telson and the 

 slender uropodal endopod will distinguish this species from the fol- 

 lowing new species, G. crosnieri. 



Etymology. — The name is from the Latin, "hi", meaning "two," 

 and "carina", meaning "keel," referring to the bicarinate ventral 

 surface of the submedian teeth of the telson. 



Distribution. — Known only from the type-locality, Nosy Be, 

 Madagascar. 



Gonodactylus crosnieri, new species 



Figure 15 



Holotype. — 1 9, 17.8; Banc de Pracel, western coast of Mad- 

 agascar; 50 m; muddy sand; A. Crosnier; June 1959; USNM 124098. 



Paratypes. — 1 9, 19.3; Lagon de Mayotte Id., Comoro Islands; 

 50 m; A. Crosnier; August 1959; USNM 124099. 1 9, 13.5; same; 

 MNHNP. 



Description. — Anterior margins of rostral plate straight or with 

 slight posterolateral slope; anterolateral angles acute but rounded. 



Ocular scales small, erect. 



Mandibular palp and 5 epipods present. 



Lateral processes of sixth and seventh thoracic somites subtruncate, 

 subequal in size or that of sixth somite slightly larger. 



Carinae of sixth abdominal somite not markedly inflated, each with 

 apical spiuule. 



Telson as long as broad, appearing elongate, with 2 pairs of slender, 

 sharp, marginal teeth; lateral teeth not developed, lateral carina 

 fusing with margin of intermediate tooth; dorsal surface of telson 



