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From the Proceedings of ths California Academy of ScienceB, April 17th, 1876. 



Description of a New Genus and Species of Decapod 



Crustacean. 



BY W. N. LOCKINGTON. 



Family PINNOTHEEID^. 



Tubicola. nov. gen. U i'^lM: :^ ^ /V-'i/l/XR 



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

 rudimentarj'. 



Habitat, the inside of the tube of an auuelid. 



rFubicaia longipes. nov. sp. 



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

 about one-third of the width of the carapace; antero-lateral 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. 



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

 the carajjace 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 setaj on its upjier border. 



Second and third pairs of legs sub-equal, longer than the first, slender, 

 ending in a sharp claw; the third pair slightly longer than the second. 



Fourth pair immensely developed, exceeding in length the width of the 

 carapace, terminating in a stout claw. 



Fifth pair shortest, reaching to about the middle of the third joint of the 

 fourth pair; usually held in an elevated position over the posterior portion of 

 the carapace. 



Width of carapace a little less than ^^ inch; length, }{ inch. 



Total length from claw to claw at fourth p<ir, ^^ inch. 



Habitat, the sand-constructed tube of an annelid. 



I found this curious little crustacean on the tube of an annelid common on 

 the sandy flats left bare at low tide in Tomales Bay. While digging for those 

 sand-excavatiug lobs' ers, the Gebice and ('allimiassre, I found in abundance the 

 sandy tubes of an annelid about six inches loug, with numerous joints or 

 nodes, each of which was surrounded by a circlet of setfe, by whose action 

 the creature propelled itself at pleasure up and down the tiibe. 



Believing the worm to be a new species, I gathered some, and while pulling 

 the tube to pieces, and admiring th'^ rich brownish red tint conspicuous at 

 each node tf my new prize, I was surprised to see a long narrow creature 



