new Species o/' Pleurotomidse. 311 



This unpretending little shell has for its chief distinctive 

 characters the rounded ribs and fine spiral striation, and the 

 lip is thickened within at a little distance from the acute 

 margin. 



Pleurotoma {Mangilia) parilis. 



Testa oblonga, subturrita, alba, inter costas prope sed infra suturam 

 rufo maculata, et supra costas punctorum ruforum eeriebus spirali- 

 bus 2-3 (in anfr. ultimo 3-4) ornata ; anfract. 7, suprcmi duo 

 laevos, convexi, cceteri paululum convexi, inferne leviter angus- 

 tiores quam supra, costis subobliquis 9-10 (in anfr. ultimo ad 

 basim attingentibus) instruct!, ubique tenuissime denseque spiral- 

 iter striati ; apertura angusta, longit. totius ^ vix sequans ; 

 labrum incrassatum, superne eemicircularitor sinuatum ; canalis 

 brevis, angustus. 



Long. 7| mill., diam. 2|. 



Hah. Gulf of California. 



This species possesses some aflSnity with P. Ooodingii, but 

 the ribs are not regularly continuous, less prominent, and 

 thicker ; it is diiferently coloured, and the form is less acumin- 

 ated at both ends. Three specimens placed as varieties are a 

 little shorter in the spire and their outer lips are somewhat 

 thicker. 



Pleurotoma {Mangilia) lata. 



Testa brevis, lata, turrita, alba, supra labrum rufo unimaculata ; 

 anfraetus 5-6, primi 2 convexi, la^ves, nitentes, ca^teri superne 

 decliviter tabiilati, deinde angulati, infra angulum plani, sed 

 versus suturam obliqui, costis 12, subrectis (in anfr. ultimo ad 

 basim continuis) instructi, et liris spiralibus 3-4, suprema circa 

 angulum sita, caeteris infra iUum, succincti ; anfr. ultimus liris 

 circiter 15 ornatus ; apertura longit. totius \ tequans ; labrum 

 incrassatum superne valde sinuatum ; columella tenue callosa ; 

 canalis brcvissimus. 



Long. 4^ mill., diam. 2. 



Hah. China seas. 



The broadest part of the whorls is at the angle, and they 

 are contracted below it. This species is remarkable for its 

 short broad form and its tabulated spire. Faint brown spots 

 are occasionally traceable below the suture between the ribs, 

 and above the angle two or three spiral lirations much finer 

 than those below sometimes occur. 



22* 



