14 DR. P. P. CARPENTER ON THE SHELLS OF PANAJI4. 



Ch. 0-B-Adnmsri, JI. oli), with straight ribs; and one with spira,! 

 sculpture, which may belung to Ch. graeiUima, JI. 530j but wants 

 the produced apex. 



228. Chemnifzia sim'di-i. This speries most nearly resembles 

 aculeus, but is broader, larger, &ud wiih mure ribs, of which I counted 

 from twenty to twenty-two (not twenty-six). I should not evil the 

 whorls "convex." They are, however, more rounded, and the bai-e 

 is more produced, than in the shell called " 1 similis," iM. 520, wliich 

 is perhaps a variety o( panamensis. 



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

 The spiral strise are on the tops of the ribs, of which I counted from 

 t'.\ enty-four to thirty-two (instead of "about forty "). 



230. Ghe.mnitzia turrita. This species includes the " Rissoa, 

 Ep. ind." no. 2.51. 



231. ? Littorina angiostoma is a Fossarus. 



232. Littorina aspera, M. 397. The Mazatlan periwinkles, being 

 in good condition, divide themselves very naturally into three 

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

 easily dealt with. Of Prof. Adams's specimens here retained, the 

 mnjority belong to aspei'a, altliongh several of the smaller ones are 

 li.'iilippii, M. 39S. The young appear to be of both species mixed. 

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

 M. 396, with a few very large philippii intermi-^ced. 



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. 404, 405, may be conspecific ; but among the mul- 

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

 sufficiently perfect to decide. The shells vary extremely in 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 excaiiafa = Fossarus e. 



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

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



237. ? Littorina foveata. 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- 

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

 Littorina or to Narica. 



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

 parvula, but is a dwarf form of the L. philippii, iM. 398. The Pro- 

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

 species ; but as he catalogued and distributed his specimens under 

 ''.parvula, and kept others under nspera, it inav be best to retain 



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