434 PROCEEDINGS OF THE NATIONAL MUSEUM. 



The eyes are large and abundantly supplied with pigment. The 

 first antennae have the basal segment strongly excavated, while the 

 outer margin is expanded into a plate-like process which bears just 

 back of the rounded tip, a small spine; the three flagella are slender. 

 The second antennae are very slender and exceed the body in length: 

 the scale is broad and long, ])ut does not exceed the rostrum ; there is 

 a small spine on the outer face of the basal segment and another on 

 the outer margin of the scale near its tip. The mandible does not bear 

 a palpus, the incisor portion is provided with two or three sharp teeth, 

 while the molar surface has three souiewhat obtuse ridges. The third 

 maxillipeds are pediform as usual, but are small. The second pair of 

 pereiopods are chelate like the first pair and exceed them slightly in 

 size; the carpus is longer than the hand and the fingers are shorter 

 than the palm. The telson narrows uniformly from the base to the 

 small rounded tip, which bears five small spines. Color in alcohol 

 yellowish; length, 30 mm. Eighteen specimens were collected from 

 the following localities: Palacio, 8; Pinar del Rio, 7; San Cristobal, 3. 



5. BITHYNIS JAMAICENSIS (Herbst). 



Represented by one large specimen from Calabazar. 



6. BITHYNIS OLFERSII (Wiegmann). 



Represented b}' specimens from Calabazar (3), Pinar del Rio (4), 

 San Juan (4), and El Sumidero (7). 



7. BITHYNIS ACANTHURUS (Wiegmann). 

 Seven specimens of this shrimp were collected near San Juan. 



8. XIPHOCARIS ELONGATA (Guerin). 



A series of seven specimens labeled "Calabazar" represent this 

 species. 



9. PEN^US BRASILIENSIS Latreille. 



Two specimens from San Juan. 



10. CAMBARUS CUBENSIS Erichson. 



Two specimens, male and female. No locality given. 



These specimens difi'er considerably from individuals from other 

 localities and may represent an undescribed form. The abdominal 

 appendages of the male and the annulus ventralis of the female are 

 those of C. cubensk, but there is a well-developed spine on the side of 

 the carapace, the areola is much narrower than usual (seven times as 

 long as wide), the margins of the rostrum are raised into high, sharp 

 ridges, the lateral teeth of the rostrum are well developed, and the 

 acumen is slender. 



