498 MAZATLAlf UNIVALVES 



Sab. Mazatlan ; 3 sp. and fragments ; L'pool Col. 



Tablet 2394 contains the middle sized sp. with its operculum 

 in situ. 



626. NASSA , sp. ind. (a) 



Tablet 2395 contains fragments of a species resembling 

 Nassa acuta, with less defined ribs, and undulating interspaces. 

 Sab. Mazatlan ; off Spondylus ; L'pool CoL 



627. NASSA , sp. ind. (b.) 



Tablet 2396 contains a young shell, white, resembling 

 N. acuta, but with the whirls less inflated. 

 Sab. Mazatlan ; extremely rare, off Spondylus ; L'pool CoL 



628. NASSA , sp. ind. (c.) 



Tablet 2397 contains fragments of a species with rather 

 flattened whirls ; the ribs crossed by raised, sharply defined 

 Krulae, with deep interstices. 

 Sab. Mazatlan ; extremely rare, off Spondylus ; L'pool Col. 



629. NASSA , sp. ind. fd.) 



Tablet 2398 contains a young shell and a fragment of a 

 globose species ; nucleus tumid, large, of nearly four whirls ; 

 normal whirls with sharp ribs, distant, crossed by rather close 

 spiral striae . 

 Sab. Mazatlan ; extremely rare, off Spondylus ; L'pool CoL 



630. NASSA , sp. ind. (e.) 



Tablet 2399 contains a young sp. (imperfect) of a species 

 resembling the last, but less swollen, brownish, with the ribs 

 tumid. 

 jELab. Mazatlan ; extremely rare, off Spondylus ; L'pool CoL 



631. NASSA PGEMMULOSA, C. B. Ad. 



Pan. Shells, pp. 61, 305, no. 46. 



{Nassa) Niotha gernmulosa, If. Sf A. Ad. Gen. i. 117. 



