421 



5. ('.*;( r.M 0BTU8UM, Cpr. 



C. (Elephant u/um) t. elunyata, tenue lirata ; ujterturai/t versu* 

 hand tumente ; septo submamillato, piirum tumeiitc, a pice ob- 

 tusissimo dorsum versus spectante : operculu ? . . . 



Test. jun. long. '04, lat. 01— •()] 1. 



Test, adult, long. -132, lat. -01 7 — 026. 



Hab. Mazatlan, rare. Mus. Brit. &c. 



Maz. Cat. p. 317. 



About a dozen specimens were found of this species. The plug 

 is mamillate in front, but ungulate behind. 



6. Cecum plicatum, n. s. 



C. (Elephant idum) t. curtiorc, longitudinuliter calde plicuta , 

 p/icis xii.-xvi., acutis ; apertura t. adolescente stellata, t. 

 adult a annul at a; iuterdum annulis indistinct is aperturam 

 versus ; plerumque superficie concentrice niinutissime striata ; 

 septo mucronato, superjicie subplanato, mucrone dactyliformi 

 subiter ascendente, apice obtuso : operculo ? 



Test. adol. long. 07, lat. 01—017. 



Test, adult, long. -105, lat. -017-0— 28. 



Bab. Sponge, W. Indies. Mus. Brit. &c. 



Thirty-eight specimens of this species were found, of which some 

 were white ; others orange, perhaps coloured by the sponge. It is 

 known by its strong plications and finger-shaped plug. Two young 

 specimens were found much straighter than the rest, and with the 

 plications finer, which may belong to a distinct species. 



Three dead specimens, received by Mr. Bean from the Mauritius, 

 do not present any characters by which they can be separated from 

 this species, except that the mucro is shorter, which is probably due 

 to their being worn. 



7. Cecum liratum, n. s. 



C. (Elephantulum) t, " C. rnamillato" simili, sed lirulis creber- 



rimis subobsoletis ornata ; septo magis elevato. 

 Lat. -025. 

 Hab. Cor. Crag, Sutton. 1 sp. in Mus. Brit. 



Only a fragment has been observed of this species, which is named 

 as being the earliest known Elephantulum. It is to be hoped that 

 those who arc able to obtain access to the locality of Crag Ceeca will 

 investigate the species. 



8. Cecum liratocincti m, Opr. 



C. (Elephantulum) t. tenue lirata, /iris plun minuter ucutis, con- 



fertis sou suhdistantibus .■ pltrumque annulis obsoletiSt sub 

 Uris monstrantibus . septo subwmeronaio, subu ngulvt o ; mmereme 



darfylifornn, r/pirr prominent >, hiteroh, urutn ', margin/- late- 



