238 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



laminate; maxillipeds moderately swollen, with two stout claws, shut- 

 ting past each other like scissor blades. 



Achtheinus pinguis, new male type. 



This species is readily distinguished from oUongus by the shorter 

 and wider carapace, by the separation of the two pairs of thoracic 

 plates to their very base, by the great enlargement of the genital seg- 

 ment in the female, and by the accessory lobes at the base of the 

 abdomen. It differs from dentatus in its relatively shorter and 

 plumper form, in the fact that the carapace is as wide as the two 

 pairs of thorax plates, in the shape of the posterior sinus of the genital 

 segment, and in the fact that its second antennae are not toothed. 



Three females and two males were obtained by the American 

 Museum of Natural History through Dr. L. Hussakof from the pec- 

 toral fin of a sawfish, Pliotrema warreni, off the Cape of Good Hope 

 in 40 fathoms of water. 



Two of the females and one male become the types of the species 

 and are retained by the American Museum, the other male and female 

 are made cotypes and are deposited in the United States National 

 Museum under Cat. No. 42302, U.S.N.M. 



ACHTHEINUS DENTATUS Wilson. 

 Achtheinus dentatus Wilson, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 630, pi. 67. 



Another finely preserved female of this species has been taken from 

 the tail of one of the cow sharks, Notorhynchus maculatus, on the Cali- 

 fornia coast. It has been given Cat. No. 42274, U.S.N.M., and is 

 worthy of record because it was obtained from a new host and one 

 which is common on our own western coast. This makes the species 

 North American, although the types were obtained off the coast of 

 Peru in South America. 



CALIGUS PHIPSONI Bassett-Smith. 

 Caligus phipsoni Bassett-Smith, Ann. and Mag. Nat. Hist., ser. 7, vol. 1, p. 7, 

 pi. 3, figs. 3 and 4. 



Plate 32, fig. 22, and plate 33, figs. 23 to 27. 



Both sexes of this species were obtained by Smith from the inner 

 surface of the gills of Cyhium guttatum at Bombay and were described 

 in the above-mentioned paper. Since his text and figures do not 

 agree in several particulars, and since his description omits some of 

 the most important characters, the following notes are here presented 

 as supplementary. They are based upon specimens taken from the 

 gills of Polynemus tetradactylus, at Batavia, Java, by Dr. Owen Bryant 

 and Mr. William Palmer. These specimens have been placed in the 

 National Museum and numbered 42304, U.S.N.M. 



Smith states that his species ''resembles C. irritans HeUer, but 

 differs in having the cephalothorax rather broader, the furcula larger, 

 the abdomen single-jointed, and in the arrangement of the bristles 

 on the caudal plates." 



