RHIZOCEPHALA — REINHARD 301 



Boschrnaia, new genus 



Genotype: Boschrnaia munidicola, new species. 



Diagnosis: Gregarious; body elongate, bifurcate, with arms 

 of unequal length. Mantle aperture covered. Stalk on right side; 

 testes adjacent to stalk. On Galatheidae. 



The orientation of the mesentery with respect to the stalk is a 

 distinguishing feature of this genus. In the previously known mem- 

 bers of the family Peltogastridae the stalk arises from the dorsal 

 or mesenterial surface, but in Cyphosaccus and Boschrnaia it is placed 

 in a lateral position. Whereas in Cyphosaccus the mesentery lies 

 uppermost when the animal is viewed in an upright position with the 

 anterior arm to the observer's left, in Boschrnaia the opposite is true. 

 Here the mesentery lies on the far side of the animal when the sac 

 is viewed in the same manner as above. Since the mesentery in 

 Rhizocephala marks the dorsal surface of the animal, the stalk in 

 this genus arises on the right side. 



The generic name Boschrnaia is given in honor of Prof. H. Boschma, 

 director of the Rijksmuseum van Natuurlijke Historic, Leiden, 

 Holland, the author of more than 80 papers dealing with the Rhizo- 

 cephala and the foremost authority on this group of animals. 



Boschrnaia munidicola, new species 



Figure 3 



Diagnosis: Anterior arm much longer than posterior one. Testes 

 minute, vasa deferentia long and straight; colleteric glands near 

 anterior end. 



Syntypes: Off Cape Lookout, N. C, Fish Hawk Station 7302, 

 U. S. Fish Commission, 7% fathoms, July 24, 1902, 9 specimens on 

 one Munida irrasa A. Milne Edwards. USNM 100945. 



Additional specimens: Off Key West, Fla., Fish Hawk Station 

 7279, U. S. Fish Commission, lat. 24°2r55" N., long. 81°58'25" W., 

 98 fathoms, Feb. 14, 1902, 14 specimens on one Munida irrasa A. 

 Milne Edwards. USNM 100946. 



Description: The parasites are attached by means of a short, 

 thin stalk to the third and fourth abdominal segments of the host. 

 They have a somewhat hook-shaped appearance. Each sac is strongly 

 bent, with one arm, which is the anterior part of the animal, nearly 

 twice as long as the other. The basal portion of the sac tapers in the 

 direction of the stalk. At the summit of the anterior arm there is a 

 knob-like prominence formed by the mantle opening. The aperture, 

 however, does not communicate with the exterior since it is covered 

 by the external cuticle. 



