abstracts: conchology 163 



lecithodes. The new species described by Goldberger and Crane is the 

 second species to be placed in this genus. It resembles Braun's form 

 very closely, but differs in being more slender, in having relatively shorter 

 ceca, in that the gut crosses at the equator of the vitellarium, and in thai 



the vitellarium is more frequently on the right side of the body. 



A New Trematode(StyplodoraBascaniensis) with a blind Laurer's canal. 

 Joseph Goldberger. Proceedings U. S. National Museum 40: 233-239. 

 1911. 



The new species described stands close to Styphlodora solitaria Looss 



and is of special interest because of the peculiarity of its Laurer's canal. 

 Instead of opening on the surface as with only one exception heretofore 

 known it always does, this duct ends blindly as a globular body of about 

 the size of the ovary very much as has been described for Aspidogaster 

 conchicola. This globular cecal end contains spermatozoa, sperm, moru- 

 las, round deeply staining bodies suggesting nuclei, and a few vitelline 

 cells. J. G. 



COXCHOLOGY. — The recent and fossil mollusks of the genus Bittium 

 from the west coast of America. Paul Bartsch. Proceedings U. S. 

 National Museum, 40: 383-414, pis. 51-58. 1911. 



This is a monograph of the west American members of this genus, 

 containing descriptions of the new sub-genus Lirobittium. 



The following species and subspecies are described as new: (Bittium) 

 panamense, johnstonoe, (Semibittium) attenuatum boreale, attenuatum 

 latifdosum; subplanatum, nicholsi; (Lirobittium) catalinense inornatum. 

 ornatissimum munitoide, asperum lomaense, cerralvoense, (Semibittium) 

 larum, Bittium oldroydce, fetellum, giganteum, casmaliense, arnoldi, 

 and mexicanum. I'- B. 



CONCHOLOGY— New mollusks of the genus Aclis from the North 

 Atlantic. Paul Bartsch. Proceedings U. S. National Museum, 

 40: 435-438, PI. 59. 1911. 



Aclis dalli, cubana, rnshi, floridana, verrilli and carolinensis are de- 

 scribed as new. "• "■ 



