158 M.O. A. L. MORCh's REVIEW OF THE VERMETIDvE. [April 9, 



f. 16, has not a single character in common with the description of 

 Lamarck. A Spondyle mutique is not mentioned in Lamarck's 

 later publications ; but I suppose it is the Spondylus microJepos, 

 Lam. (no. 16), according to the expression " cet Spondyle semble 

 mutique" a species not even mentioned in Chenu's Monograph. A 

 query is added to the locality " Ocean indien." I refer to this spe- 

 cies the following varieties : — 



Var. a. sauAMULOsA. 



T. albescens, planorbifor7nis vel repens, scepe profunde corrodens, 

 longitudinaliter lirata ; lirce approximatcB, hue illuc alternatim 

 minores, nodulis transversim compressis sat remotis, et in locis 

 occultis squamis parvis acutis ornatis ; lirts 1—3 laterales inter- 

 dum validiores ; strice incrementi obliquee, obsoletce, squamiferce; 

 apertura subcircularis. 



Operculum membranaceum, diaphanum, pallide fiavum, superne sat 

 concavum, vix striatum, inferne convexum, limbo latissimo planu- 

 lato,flavo, nitido, liris concentricis tribus ; mammilla centrali 

 prominente obtusa, obscure purpurea, fascia basali aurantia 

 circumdata. 



Diam. If m. 



On Tridacna scapha, Meusch. (Mus. reg.) 



Var. /3. BIFUNICULARIS. 



T. crassa, profunde erodens, transversim oblique ruguloso-squamosa, 

 longitudinaliter subtilissime lirulata, liris duabus latis subti- 

 lissitne longitudinaliter liratis. 



Diam. 4 m. ; diam. operculi 3 m. ; lirse circiter | m. latfs. 



On Turbo margaritaceus, var. 1 The two broad longitudinal 

 grooves look like a cast of the furrows of the Turbo. 



Var. y. cristata. 



T. triquetra, crassiuscula, carina mediana squamis validis re- 

 motis ; utrinque angulis acutis, squamis latis angulaiis ornatis ; 

 lirce incrementi liulcherrimee, regulares, arcuatce, leviter flexce 

 in interstitiis ; apertura superne rectangularis. 



Diam. 2| m. 



On the same shell as the preceding, burrowing in the suture. Not 

 unlike Vermetus carinatus, Rouss. (Chenu, 111. t. 2. f. 4). 



Var. S. stjbdecussata. 



T. repens, profunde immersa, obtuse quadrangular is, antiquata, 

 lirulce longitudinales subtilissimce, interruptce, strice et lirul<B 

 incrementi subtilissime conferte undulates, unde obsolete gra- 

 nulosa. 

 Diam. 2 m. Operculum differt a prsecedeutis macula coccinea 

 centrali latiore. 



This variety, as well as the preceding, is very like S. lituella, 

 no. 6. On the operculum was found a bristle with minute distant 

 spines ; but I am not sure that it is not quite a foreign body. 



