UROCOPTID MOLL VSKS—BARTSCH. 



155 



the shell with acid until the body could be lifted out unbroken. The foot projected 

 sliortly from the rather thick collar of the mantle. It is short and proportioned 

 al)out as in Ilolo.ynrn. The narrow lung extends somewhat more than half a whorl. 

 Its surface is plain, without perceptible venation, except for the long pulmonary 

 vein ( p. r. ) . The kidney ( A' ) is wedge-shaped and but slightly longer than the peri- 

 cardium, exactly as in Holospira as figured in the Manual of Conchology, Uroroptidn; 

 pi. 27, fig. 37. It is bright pink and 3 mm. long. There is apparently no secondary 

 ureter, nor is there any groove along the intestine {G. 4). The intestine is of the 

 usual four-folded type, and penetrates only a short distance behind the heart and 

 kidney. 



The very long liver and the ovotestis occupy the whole of the earlier whorls. 



"The genitalia were undeveloped and thread-like. There is a ratiier long atrium 

 and an excessively long vagina. The penis was represented ])y a minute bud-like 

 tubercle only, and was evidently not yet developed. Its retractor was not seen if 

 present. 



"The jaw is very thin, arcuate with faint, well-spaced vertical strife, as in Holospira. 

 The radula has teeth of the Holosj)ira type. The rhachidian and six laterals are uni- 

 cuspid, the cusps obtuse and as long as the basal plates. The marginal teeth have a 

 small ectocone and the mesocone becomes longer." 



In a letter Doctor Pilsbry adds: "This is the most interesting thing which has 

 turned up in ^Mexico since Metostraam, . . . Your surmise that it was a Urocoptid 

 turns out to be correct. The very short kidney, scarcely longer than the pericar- 

 dium, alone settles it. These organs, as well as the jaw and teeth, are exactly as in 

 Holospira, next to which it evidently belongs." 



Since the edition of the orig-inal publication of this remarkable spe- 

 cies was rather limited, I have 'considered it advisable to repeat Doctor 

 Dall's description and to give his figures in this connection. 



There arc eight specimens in the type lot. Six of these are perfect 

 and p-'ive the followinof measurements: 



Meusureincids of Hciidergouiclla jialmcri. 



"Type 

 UROCOPTIS (COCHLODINELLA) POEYANA VARIEGATA Pfeiffer. 



There are seven lots, 38 specimens of this form in the collection of 

 the U. S. National Museum from Florida. They come from the fol- 

 lowing localities and give the measurements of the subjoined table: 



