14 DR. P. P. CARPF.NTEU OX TUT PHTLLS OF PANAMA, 



Ch. C-D-.-iifniiisii, M. 51!), with strai'^^ht nil)s ; and one with spiral 

 soiiljjture, wiiioh may belong to C7i. yracilliiiia, M. 530, but wants 

 the produced apex. 



22S. Chemnifzia sirnUit. This speries most nearly resembles 

 arufetts, but is broader, larger, and wiili more ribs, of which I counted 

 iVom twenty to twenty-two (not twelity-six). I should not call tiie 

 whorls "convex." They are, however, more romuled, and the base 

 is more produced, than in the shell called " 1 simi/is," M. ol'O, which 

 is perhaps a variety of panamennis. 



229. Chemiiifzia striosa. The early whorls are very slender. 

 The spiral striae are on the tops of the ribs, ot' which 1 counted from 

 twonty-four to thirty-two (instead of "about forty"). 



230. Chemnitzia turrita. This species includes the " Rissoa, 

 5p. ind." no. 251. 



23 1 . ? Littorina angiosto7na is a Fossarus. 



232. Littorina aspera, ^I. 39". The Mazatlan jjcriwinkles, being 

 in good condition, divide themselves very naturaily into t'.ree 

 .species. The Panama specimens, being generally eroded, are not so 

 easily dealt with. Ot Prof. Adams's sj)ecimens here retained, the 

 majority belong to aspera, altliough several of the smaller ones are 

 pliilifipii, M. 39S. The young appear to be of both species mixed. 

 The " variety " consists of the abnormal tall specimens of conspersa, 

 M. 396, vvith a few very large p/ii/ippii intermixed. 



233. Littorina atrata. This abundant little shell is a Fossarus, 

 of which the Professor's lAdeorbis abjecta, no. 257, is a more ad- 

 vanced form. It is possible that one of the Fossari described in 

 Maz. Cat., nos. 4U4, 405, may be conspecific ; but among the mul- 

 titude of specimens I could not find one with the nuclear whorls 

 sufficiently perfect to decide. Tiie shells vary extremely iu shape 

 nnd sculpture. 



234. Littorina conspersa, M. 396. Smaller and generally more 

 stumpy than the Mazatlan shells, but containing a few specimens of 

 the same extreme forms. 



235. ? Littorina excavata= Fossarus e. 



236. Littorina faseiata, M. 400. The specimens of this species 

 and of L. varia graduate rather closely towards each other. 



237. 1 Littorina foveatn. A good species of Fossarus. Read, 

 **Last whorl angular" at the umbilicus [not " below the middle"]. 



238. ? Littorina megasoma. This is also a good species of FoS' 

 earus. The Professor was doubtful whether to refer these forms to 

 Littorina or to Narica. 



239. Littorina 1 parvula, C. B. Ad. This is not Philippi's L. 

 parvula, but is a dwarf form of the L. jihilippii, M. 398. The Pro- 

 fessor suggests the name L. dubiosa tor this sufficiently well-marked 

 species ; but as he catalogued and distributed his specimens under 

 'I parvula, aud kept others under aspera, it may be best to retain 



188 



