ANNELID GENUS CAMBARINCOLA — HOFFMAN 339 



No further attention was paid to this group of branchiobdeHids 

 until 1940, when there appeared the general monograph of the 

 American species, by Clarence J. Goodnight. This paper is of 

 interest to us at this point largely because of the remarkable treatment 

 of the species of the Philadelphica group. In the case of Cambarin- 

 cola, he recognized two subgenera, making the distinction by the fol- 

 lowing contrast: 



Upper lip composed of four subequal lobes. . . . Coronata, n. subg. 

 Upper lip entire excepting a small median emargination. 



Cambarincola, n. subg. 



According to Goodnight, the nominate subgenus consisted of the 

 generotype species macrodonta, and elevata Goodnight, vitrea Elhs, 

 and inversa Ellis. His new subgenus included the type philadelphica 

 and chirocephala of Ellis. Curiously enough, this subgeneric di- 

 chotomy was proposed in defiance of a statement by Ellis which 

 Goodnight then quoted under the treatment of philadelphica: "It 

 was also found that worms of this species could flatten the entire 

 lip, so that the lobes were scarcely visible." The virtue of Good- 

 night's groupings can be estimated by the fact that macrodonta, of 

 one subgenus, can hardly be separated from the species of the other, 

 while the nominate subgenus as originally proposed contamed species 

 which we now know to belong in three different genera. There is 

 no defensible reason for continued recognition of the name Coronata, 

 it is an absolute junior synonym of Cambarincola in the strictest 

 sense. 



Subsequent to 1940, one additional species has been named which 

 is referable to the Philadelphica group. This is Cambarincola meyeri 

 Goodnight, 1942, from central Kentucky. 



The exact status of C. okadai Yamaguchi remains in great doubt. 

 The species was described on the basis of worms taken from American 

 crayfish introduced into Lake Chuzenji, near Nikko, Japan. The 

 combination of tentaculated peristomium and homognathous, penta- 

 dont jaws strongly suggests that okadai is a senior synonym of the 

 species here nained fallax. The same combination, however, is found 

 in the western macrocephala, and until more is known about the type 

 nuiterial of okadai, or at least the origin of the crayfishes upon which 

 it lived, we may continue to regard the species as inquirendum. 

 Goodnight (1940, p. 41) dismissed okadai as probably based on speci- 

 mens of philadelphica, ". . . as it differs from it only in the dentition 

 of the lower jaw, and C. philadelphica is an extreme variable form as 

 outlined above." The "above" referred to here is the quotation 

 from Ellis's 1919 paper concerning variation in peristomial form only. 

 Ellis did not consciously stretch variability in his philadelphica so far 

 as to embrace two entirely different jaw shapes. 



