308 



Annals of the Carnegie Museum. 



Ptychobranchus foremanianus (Lea). 

 The soft parts of this species have been described by Lea (Obs., X, 

 1863, p. 443), and have been figured by him under the synonym 

 woodwardianits (Obs., VII, pi. 29, fig. 103), and this species surely 

 belongs in this genus. 



Ptychobranchus clintonensis Simpson. 

 This species also belongs here, as is shown by Simpson's description 

 (1900c, p. 79). 



Ptychobranchus subtentus (Say). 

 Soft parts of one male and one gravid female were received from the 

 Cumberland River, Burnside, Pulaski Co., Kentucky (B. Walker). 



mp 



Fig. 15. Ptychobranchus subtentus (Say). Gravid female from Cumberland 

 River, Burnside, Pulaski Co., Ky. (Cam. Mus., No. 61, 4,971.) (Anal and supra- 

 anal conjectural.) 



The soft parts of this species are entirely like those of P. phaseolus. 

 The only difference I detect is in the extent of the marsupium, which 

 consists of only five folds in my specimen, and does not occupy all 

 of the outer gill, but leaves free a small section in front, and a somewhat 

 larger one behind. Since I have only one female, I cannot tell whether 

 this is always so, but I think it is unimportant, since likewise in P. 

 phaseolus a considerable portion of the posterior end of the outer gill 

 is non-marsupial in young individuals. 35 The anal seems to be almost 

 smooth, and nothing can be said about the supra-anal, since these 

 parts are badly injured in both specimens. Posterior margins of 

 palpi connected only at base. Inner lamina of inner gills in both 



36 This is most noticeable in a young gravid female of P. phaseolus from Arka- 

 delphia, Arkansas. 



