100 TIIK NAUTILUS. 



COCHLIOPA PICTA n. sp. PI. ix, figs. 1, 2. 



The shell is depressed, solid, narrowly umbilicate, there being a 

 minute perforation and a curved, semicircular rimation where it 

 enlarges at the last whorl; inner whorls pale olivaceous corneous, 

 the last encircled with many dark olive spiral lines and bands, which 

 are almost imperceptibly raised. The spire is convex, and narrow 

 viewed from above, the last whorl being very wide. Whorls 3^, the 

 last rounded, indistinctly plicate radially around the umbilicus. The 

 aperture is rounded-ovate, angular above; outer lip thin; columellar 

 lip rather heavily calloused; parietal wall short, calloused. Alt. 

 2.1, diam. 3.7 mm. 



Coy river, near the ford on road to Tampamolon, State of San 

 Luis Potosi, Mexico. A few smaller specimens were taken in the 

 Ganina river near Rascon. 



This species differs from C. riograndensis by its much smaller 

 umbilicus, opening out only at the last half whorl. The spire is also 

 more depressed. Many specimens were taken. 



RECTIFICATION OF THE NOMENCLATURE OF THE NUDIBRANCHIATA 

 IN LERMOND'S " SHELLS OF MAINE." 



BT FRANCIS N. BALCU. 



A meritorious attempt by Norman "Wallace Lermond to list the 

 mollusca of Maine has recently appeared under the title indicated 

 above, and has been noticed in a recent number of the Nautilus. 



Considering the confused state of our knowledge (or rather ignor- 

 ance, for knowledge we have little) of the Nudibranchs, it is scarcely 

 a reflection on Mr. Lermond that his list of this most interesting but 

 neglected group reflects the state of knowledge of nearly forty years 

 ago. It is a painful admission that the additions to our knowledge 

 since that time have been few and scattering, but such as they are 

 they should be recognized; and Mr. Lermond's list, otherwise of 

 considerable use as almost the only recent list of Nudibranchs from 

 the northeast coast, might do mischief if allowed to stand uncor- 

 rected in this particular — hence the following remarks. 



Aeolis purpurea Stimps. in all probability is Cratena pustulata 

 (A. & H.), as Bergh believed, and should be written accordingly, 

 though with a query. 



