VERMETUS. 119 



Subgenus Thylacodes, Guettard, 1174. 

 Y. POLYPHRAGMA, Sassi. PL 52, figs. 60-62. 



Solitary, irregularly twisted, commencing irregularly spiral, 

 with dilated suture, afterwards rounded, longitudinally finely 

 striate, the strife often alternately smaller, frequently granose, 

 sometimes with three or four strong lirse, remote nodules and 

 intervening brownish punctations ; color usually whitish or 

 yellowish white. Aperture, 14 mill. wide. 



Mediterranean Sea. 



The synonyms are V. arenaria, Lam., in part., Serpula infes- 

 tina, Salis, Dentalium intestini/orme, Linn., teste Hanle}", V. 

 gigas, Gray, in part. 



Yar. ALETES, Morch (fig. 62). Laterally- attached, almost regu- 

 larly spiral ; last whorl somewhat protracted. It is V. 

 lineolata, Gravenh. 



Yar. AMPLA, Morch. Loosely contorted, rather thin, whorls 

 scarcely contiguous, the last rather short, solute, with approxi- 

 mating small longitudinal lirje decussated by incremented 

 strife, interstices lightly punctate; last whorl with two or 

 three interrupted lirae above, elongately nodulose ; whitish, 

 or yellowish white, first whorls light violaceous. 



Malta. 



Y. DENTiFERUS, Lam. PI. 52, fig. 63. 



Large, subsolitary or often conglomerated, irregularl}- twisted 

 at first, with rugose growth-striae, fine longitudinal lines, and 

 frequently two or three longitudinal riblets bearing distant 

 tubercles. 



Indian Ocean, Australia. 



Morch describes a var. repens. The following species is 

 probabl}^ only a variety, and both might be referred to V. poly- 

 jihragma. The Lamarckian examples appear to include several 

 species, according to M. Yaillant ; I give the form as restricted 

 b}' Miirch. 



Y. NoV-iE-HoLLANDI^, Rouss. PI. 53, fig. 64. 



Shells agglomerated, inferiorly contorted, then protracted, 



