276 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



are at all explicit concerning details which now must be known for 

 the identification of species in the family. 



I have discovered that Cambarincola has become something of a 

 catch-all name which has been stretched to cover a wide diversity of 

 species since its original proposal. So far, 13 species have been named 

 in the genus, listed chronologically as follows: 



C. philadelphica (Leidy, 1851) C. floridana Goodnight, 1941 



C. macrodonta Ellis, 1912 C. meyeri Goodnight, 1942 



C. vitrea Ellis, 1918 C. macrocephela (sic) Goodnight, 



C. chirocephala Ellis, 1919 1943 



C. inversa Ellis, 1919 C. gracilis Robinson, 1954 



C. okadai Yamaguchi, 1933 C. branchiophila Holt, 1954 



C. elevata Goodnight, 1940 C. machaini Holt, 1955 



Of the above names, I have seen the type specimens of all but two : 

 'philadelphica and okadai. If Joseph Leidy prepared slides of his 

 specimens, their present location is unknown. The specific concept 

 of philadelphica here adopted was derived from topotype specimens, 

 kindly obtained in Philadelphia b}'' Mr. C. W. Hart, which agree in 

 every particular with the original description. Information on C. 

 okadai has been hmited to what can be deduced from the description. 

 Types of the remaining 11 species are in the collection of the Division 

 of Marine Invertebrates, U.S. National Museum, and have been 

 studied through the kindness of Dr. Fenner A. Chace. 



On the basis of the generic concept developed during the course of 

 this study, it has been determined that several of the foregoing species 

 do not belong in Camharincola as now defined. These are: 



C. inversa Ellis: This species differs from C. macrodonta in details 

 of the bursa and in lacking a prostate gland, as well as in the form 

 of the jaws. Only the type slide has been available for study, but it 

 is evident that inversa belongs to a different, as yet undefined genus. 



C. elevata Goodnight: The internal structure cannot be seen in the 

 poorly mounted holotype, but the recent examination of topotype 

 material shows that this species likewise is not congeneric with 

 macrodonta, and is being included instead in a new genus being readied 

 for publication by Dr. Holt. 



C. machaini Holt: This species, and some others as yet unnamed, 

 differs strikingly from the cambarincoloid forms in having a very 

 long, filiform, protrusible penis, and forms the basis of another new 

 genus soon to be proposed. 



With these deletions, the number of valid forms in the genus to the 

 present is reduced to 10. The examination of a great number of 

 specimens in the Holt collection has disclosed a fair number of the 

 described species (6 of the 10) and even more undescribed forms, of 

 which 12 are named in the following pages. The type specimens of 



