PUGET SOUND CRUSTACEA. 281 



male offer no marked distinction from the present species. In 

 the male, however, the abdomen tapers much less rapidly and 

 the last segment is twice as broad as long. The thoracic seg- 

 ments are somewhat more expanded laterally, and the last 

 thoracic is considerably wider than the first abdominal segment. 

 It is stated that " the small conical mouth appears to be pro- 

 tected on each side by a minute 2-jointed foot jaw," but it does 

 not seem probable that the appendages figured are really the 

 maxillipeds. 



While the few details available in the case of these species 

 render it impossible to enumerate the characters which distin- 

 guish Pseudione Giardi from the other members of the genus, 

 it appears to be most closely allied to P. Hyndniamii, as was, 

 indeed, to be expected from the nature of its host. Its precise 

 specific delimitation can only be effected when we are in pos- 

 session of fuller information with regard to the last named and 

 other species. 



I have recently received by the kindness of the author a copy 

 of Dr. Hansen's beautiful memoir on the Isopoda of the "Al- 

 batross" expedition (Bull. Mus. Comp. ZooL, XXXI, 5, 1897), 

 in which he describes and figures Pseudiojie galacantlice from 

 the deep-sea galatheid Galacantha dionicdece. In spite of the 

 very different host and habitat the new species appears to differ 

 only in trivial characters from our own. Dr. Hansen however 

 recognizes a rudiment of the first maxilla in both sexes where 

 we have only been able to see the membranous interspace be- 

 tween the mandible and the labrum. 



Argeia sp. 



Two specimens on Crangon affinis, De Haan. Both speci- 

 mens were in very bad condition, having been apparently al- 

 lowed to dry, and nothing could be made out of their structure. 

 Relying, however, on the principle of MM. Giard and Bonnier, 

 that no species of the Epicaridea infests more than one species 

 of host, we may conjecture that these represent a new species of 

 Argeia in addition to the two already known from the west coast 

 of America ; A. piigcttensis, Dana, on Sclerocrangon iniinitiis 

 and A. pauper ata, Stimpson, on Crangon franciscorum. 



