10 Bulletin American Museum of Natural History [Vol. LIII 
Mem. Mus. Comp. Zo6él., Cambridge, X XVII, p. 235, Pl. vi, figs. 11, 12, text figs. 
64-67. Prsra, 1915, Archiv f. Naturg., LXX XI, Abteil. A, Heft 1, p. 113. Batss, 
1916, ‘Beitr. Kenntnis Meeresfauna Westafrikas,’ II, p. 14. 
On the West African coast, this familiar American form ranges from Senegal as 
far south as Angola (Balss). 
Banana, July 1915,10,1@. 
Balss directs attention to the observations of Lefebvre which indi- 
cate its adaptation to a fresh-water habitat in Lake Ahémé, Dahomey. 
This species is readily distinguished from the next in not having lateral 
marginal spines on the telson. 
PARAPENEOPSIS Alcock 
Parapeneopsis Aucock, 1901, ‘Cat. Indian Deep-Sea Crust.,’ p. 14; 1906, ‘Cat. 
Indian Decapod Crust., Pt. 3, fase. 1, p. 34. 
Parapeneopsis atlantica Balss 
Plate I, Figure 2 
Parapenzxopsis atlantica Bauss, 1914, Zool. Anz., XLIV, p. 593; 1916, ‘Beitr. 
Kenntnis Meeresfauna Westafrikas,’ II, p. 16, text fig. 2. 
Trachypenzus constrictus var. africana Batss, loc. cit., 1916, p. 17, text figs. 3, 4. 
Known from a number of localities from the Gold Coast, Togo, Dahomey, 
Cabinda, the French Congo and Angola (Balss). 
Banana, 1 .1i2 @", | 
MEASUREMENTS.—Of the single male: rostrum 7.5, carapace 10.8, 
abdomen and telson 30, telson 7 mm. long; of largest female: rostrum 28, 
carapace 26, abdomen and telson 65, telson 16 mm. long. 
The females here assigned to Parapeneopsis atlantica are so in agree- 
ment with the figures Balss gives for his variety africana that I feel sure 
that he failed to note that the last three and not only the last two pairs of 
legs lack epipodites, and the fact that the longitudinal suture of the 
carapace extends nearly to the posterior margin, as in the male P. 
atlantica. 
The male has a short, evident post-rostral carina behind the epi- 
gastric tooth half-way to the posterior margin of the carapace. In the 
female it is equally long and, moreover, it extends backward nearly to the 
posterior margin of the carapace as a smooth band, a suggested but not 
raised carina. The triangular area lying between the hepatic spine, the 
orbital margin and the post-rostral carina is more or less lightly pubescent 
in both male and female. The spines and sulci of the carapace are in 
exact agreement in both sexes; the groove beneath the hepatic spine 
fails to reach the margin of the carapace near the antero-lateral angle. 
Balss’s figure of the female (loc. cit., 1916, text fig. 3) is surely incorrect 
