ACADEMY OF SCIENCES. 55 



antennae longer than its peduncle. Body narrow in front, gradually increasing 

 in width towards the tail. 



Peduncle of caudal appendages more than half the length of the terminal 

 filaments. 



Length, - 3 % inch. 



This interesting little Isopod was recently obtained by Mr. W. N. Lockington 

 while collecting at Tomales Bay and vicinity, and is, so far as I am aware, the 

 first example of the genus found on this Coast. In that excellent work, 

 "British Sessile Eyed Crustacea" (Bates & Westwood), two species are 

 accredited to N. A., but we find no mention of them by any American author 

 we have applied to, and it is most probable that they were from the eastern 

 part of the continent. We therefore venture to offer this as new. A single 

 specimen only was found, although several casts of the net were made. It 

 would seem, therefore, very uncommon in that locality. We hope, however, 

 that by diligently searching the fresh water ponds and streams along our 

 Coast it may be found in greater numbers, with, possibly, other species of the 

 genus. I hope that collectors will carefully examine our fresh waters for this 

 Crustacean, thereby enhancing the value of our cabinet, and aiding students 

 in acquiring a knowledge of these very interesting little creatures. 



W. N Lockington read the following description of a new 

 genus and species of Decapod Crustacean and the male of 

 Phyllodurus abdorninalis : 



Description of a New Genus and Species oi' Decapod 



Crustacean. 



BY W. N. LOCKINGTON. 



Family PINNOTHEEID^. 



I 



Tubicola. no v. gen. 



Carapace extremely broad; fourth pair of legs much elongated, fifth pair 

 rudimentary. 



Habitat, the inside of the tube of an annelid. 



Tubicola longipes. nov. sp. 



Carapace broad, transverse, more than twice as wide as long; front occupying 

 about one-third of the width of the carapace; anterolateral margins broadly 

 rounded; postero-lateral somewhat concave, the two meeting at an acute angle 

 in the middle of the side of the body; posterior margin straight. 



Branchial regions largely developed, tumid; a long transverse depression in 

 the carapace behind the gastric region ; antero-lateral margin bordered by a 

 fringe of setae. 



Third joint of external maxillipeds very small; second joint stout and large. 



First pair of legs short, with short carpus and flattened elongated manus 

 having a fringe of set;e on its upper border. 



