454 bulletin: museum of comparative zoology. 



The largest from this locality is 32 mm. (tip of rostrum broken off). 

 The rostrum reaches either just to the end of the scale or a little 

 beyond it; the superior teeth vary from 6 to 9, 3 of which are on 

 the carapace proper or behind the line of the orbits. 



The outer of the two long flagella of the antennules is as long as the 

 flagellum of the antennae, or about twice as long as the body. 



The postero-lateral angle of the fifth and sixth segments of the 

 abdomen is subacute. 



Palaemonetes cubensis Hay. 



Palacmonctes cubensis Hay, Proc. U. S. nat. mus., Feb. 2, 1903, 26, 

 p. 433. 



Arroyo de la Cruz, Province of Pinar del Rio. One specimen 

 collected by Dr. Rafael del Pino, May 4, 1912, presented by Dr. 

 Carlos de la Torre. M. C. Z., 7,442. 



Laguna Las Cafias, Marti, Province of Matanzas. Two specimens 

 collected by Dr. Rafael Gomez Guardiola, April 25, 1912, presented 

 by Dr. Carlos de la Torre. M. C. Z., 7,447. 



Macrobrachium olfersii (Wiegmann). 



Palaemon olfersii Wiegmann, Arch. f. naturgesch., 1836, 2, 1, p. 150. 



Near Guaos, Jurisdicion de Cienfuegos. M. C. Z., 7,421. One 

 specimen was infested with an isopod parasite (Probopyrus panamensis 

 Richardson) in its left branchial cavity. 



HIPPOLYTIDAE. 



The genera of this family are usually characterized by the presence 

 or absence of a cutting edge and a palp on the mandible, and the 

 number of segments (varying from 2 to "many") into which the 

 carpus or wrist-joint of the second pair of pereiopoda is divided. 



The new form described below resembles Latreutes Stimpson, 1 

 Platybema Bate, 2 and Nauticaris Bate, 3 in lacking a cutting edge on 

 the mandible, while differing from them in the large number of carpal 

 segments of the second foot. In this respect it resembles certain gen- 

 era established by Bate, viz. Chorismus, 4 Merhippolyte, 5 and Am- 

 phiplectus, 6 all of which, however, have a cutting edge on the mandible. 



1 Proc. Acad. nat. sci. Phila., 1860, p. 27 [96]. 

 » Challenger rept. Zool., 1888, 24, part 52, p. 578. 

 « Op. cit., p. 602. * Op. cit., p. 616. 



* Op. cit., p. 618. 6 Op. cit.. p. 622. 



