100 MAZATLAN , UNIVALVES 



with denticles inside ; notch deep but narrow. Whirls rounded, 

 with 11 13 radiating costse, decussated by spiral striae, of 

 which about 5 shew on the upper whirls. Long. *38, long, 

 spir. '23, lat. '17, div. 32. 

 Hob Gulf of Nicoya ; 18 fm. mad ; Hinds. Mazatlan ; 2 sp. 



only ; L'pool Col. 



Tablet 1912 contains the largest specimen. 



472. CLATHURELLA AUREA, n. s. 



Cl. t. valde attenuatd, aured, epidermide tenui, interdum 

 aurantid, tinctd ; anfr. ix. convexis, canali infrasuturali latiore, 

 lincis increments arcuatis distinctis ornato ; tuberculis costce- 

 formibus viii x. rotundatis in peripkeriam, secundum lineas 

 spirales, iii. in spird, tuberculatis ; anfr, ult. costulis radianti- 

 bus infra tuberculos confer tis t lirulis confertis spiralibus tuber- 

 culatis ; aperturd et canali subelongatis labro varicoso, crasso, 

 intus dentato ; sinu postico prof undo, angusto, spiram subascen- 

 dente, supra calloso ; labio tenui, dentato. 



Approaches Cl. bicanalifera, Sow. but differs in the narrow 

 slit, and singularly decussated groove. The varix is extremely 

 thick. The costular tubercles which appear on the spire, do 

 not correspond with the narrow crowded ribs which appear on 

 the basal portion. It is more slender than Cf. rava, with dif- 

 ferent colour and sculpture. Long. '54, long. spir. "26, lat. '18, 

 div. 25. 

 Hab Mazatlan ; 1 fresh specimen ; L'pool Col. 



Tablet 1913 contains the specimen. 



GENUS MANGELIA, Eisso. 



Hist. Nat. Eur. Her. vol. iv. p. 219, 1826 : do, Leach, ms. 

 H. $ A. Ad. Gen. vol. i. p. 99. (JSTon Mangelia, Eve. Conch. 

 _Z~c. = Cithara, Sckum.) 



Mangilia (err. cor.) Phil. JIandb. Conch, p. 38. , 



473. MANGELIA PACUTICOSTATA, var. SUBANGULATA. 



M. t. rubro-fuscd, subturritd ; apice hand acutd, anfr. iii. 



lavibus ; anfr. normalibus iv. + , excurvatis ; costis x. 



acutioribus, subundulatis, ad basin continuis, lineis plerumque 

 spiram oblique ascendentibus, ad peripkeriam subangulatw ; 



