MI BOH ILO. 



10. />'. (,1.) //mArv.s-M/v//; Ah. in Tlies. ii, p. :M, |,l. PJ'l. f. \ 

 A/t/iiKft inn thulnnn'mrt'hi Sou r... < 'nin-h. Icon., xvi, f. 'J. I'. 

 ProO. Linn. Soc. N. S. \Vah-. ii. p. 7'.'. 



Tin- near alliance of tl 1 to the // i liouninthe 



convex OOlumellar ril> which forms tin- basal spout. as in //. j,i 

 and tin- pattern i Imt n:>t color <.f tin' mark inir-. which IB exactly as 

 in //. i'f/iun. There can he no doubt of the localities ^iven above, 

 as the extreme eastern and we.-tern limits are attested by many ex- 

 cellent authorities, and are represented by many specimens before 

 me. 



The shell, when fresh, is covered hy a thick brown cuticle, which 

 projects at the lip well beyond the calcareous layer. The black 

 hands are reduced to narrow lines in one lot of about 50 specimens 

 from the Sandwich Is., in the Academy collection ; one of these 

 being represented in fig. 6, but some others have them still narrower 

 and fainter. 



This species has appeared in the books under many names, but 

 by the nature of things none can antedate amplustre of Linnaeus' 

 tenth edition of the Systema. 



Genus MICROMELO Pilsbry, 1894. 



Bullina FER. in part (see ant., p. 175). Hydatina Auct. in part. 

 Bullinula GRAY, not Swains. 



Shell oval, rather thin, with exposed nearly flat spire of several 

 whorls and minute, uptilted, subimmersed nucleus. I ,ast whorl large 

 spirally striate-punctate, with a color-pattern of two or three spiral 

 and many wavy longitudinal lines. Aperture pear-shaped, dilated 

 and rounded below; outer lip a little notched at suture ; colnmella 

 concave, with reflexed edge, obscurely folded above. Type M. un- 

 data Brug. 



Animal not completely retractile into the shell ; head disc bearing 

 two flat tentacular processes in front, produced behind in two large 

 lobes partly covering the shell. Eyes wanting? Foot large; stom- 

 ach without bony plates; dentition unknown (pi. 59, fig. 26, M. 

 giitimense). 



This genus differs from Hydatina and Aplustrum in the spirally 

 sculptured shell, the animal having two, instead of four tentacular 

 processes on the head disk. I have not followed Fischer in consid- 

 ering B. undata Brug. the type of Jin f linn F'r. because Frussac 



