C ALYPTR.EA. 



Species 21. (Fig. 31 a and 31 b, Mus. Cuming.) 



Calyptr^a Balanoides. Calyp. iestd oblique conicd, 

 irregulari, radiatim minute striata et promiscue cos- 

 tato-corrugatd, alba, verlice acvio, subuncinato ; ap- 

 pendice interna obliqtid. 



The Babnacle-like Calypth.«a. Shell obliquely 

 conic, irregular, radiately minutely striated and pro- 

 miscuously rib-wrinkled, white, top sharp, slightly 

 hooked ; internal ap])endage oblique. 



Uab. Island of Bohol, Philippines ; Cuming. 



The wrinkled sculpture in this little Balanus-]^k.(i species 



takes somewhat the form of straggling ribs. 



Species 33. (Fig. 33 a and 33 i, Mus. Cuming.) 

 CalyptRjEA cornea. Cahjp. testa transverse ovatd, de- 



pressd, radiatim minute striata, concentrice lineata, 



complanatd, parum corrugatd, vertice postico, unci- 



nato ; appendice interna ohliqud. 

 The horny CALYPTKiEA. Shell transversely ovate, 



depressed, radiately minutely striated, concentrically 



lineated, smooth, but little wrinkled, top posterior, 



hooked ; internal appendage oblique. 

 Broderip, Trans. Zool. Soc. vol. i. p. 197. pi. 37. f. 5. 

 Eab. Peru (from sandy mud at the depth of nine fathoms) ; 



Cuming. 

 A plain depressed shell, finely hooked, and inclined 

 posteriorly. 



Species 33. (Fig. 33 a and 23 i, Mus. Cuming.) 

 CalyptRjEA DiAPHANA. Calyp. testa ovatd, rude con- 

 vexd, pelliicido-albd, diaphand, radiatim minute striatd, 

 striis subdivaricatis, concentrice corrugatd, rugis pli- 

 cato-reticulatis, vertice postico, obtuse uncinato ; ap- 

 pendice interna obliqud. 

 The DIAPHANOUS Calyptr^a. Shell ovate, rudely 

 convex, transparent-white, diaphanous, radiately mi- 

 nutely striated, striae subdivaricate, concentrically 



corrugated, wrinkles plicately reticulated, top pos- 

 terior, obtusely hooked ; internal appendage oblique. 

 Eab. Philippine Islands ; Cuming. 



Of peculiariy clear diaphanous substance, sculptured 

 with a promiscuous open network of tumid wrinkles. 



Species 34. (Fig. 24 a and 34 b, Mus. Cuming.) 

 Calyptr.ea STELLA. Calyp. testa suborbicidari, planu- 



latd, liris subtilibus radiantibus striis concentricis de- 



cussatis, dense nitide stellatd, vertice subcentrali, parvo, 



acuta ; appendice interna brevissimd. 

 The star Calyptr^ea. Shell nearly orbicular, rather 



flat, closely neatly starred with fine radiating ridges 



crossed with concentric striae, top nearly central, small, 



sharp ; internal appendage very short. 

 Hal). Belize, Honduras; Dyson. 



The sculpture of this little thin flattened species is more 

 regular and symmetrical than in any other species. It 

 appears to represent a different type. 



Species 25. (Fig. 35 a and 35 b, Mus. Cuming.) 



Calyptr^a varia. Calyp. testa orbiculari vel transverse 

 ovatd, plano-eoncavd, nunc tenui, nunc crassiusculd, 

 radiatim creberrime striatd, laevigata, pellncido-albd, 

 vertice subcentrali, parvo, subacute; appendice interna 

 latiusculd. 



The variable Calyptr^a. Shell orbicular or trans- 

 versely ovate, flatly concave, sometimes thin, some- 

 times rather thick, radiately very closely striated, 

 smooth, transparent-white, top nearly central, small, 

 rather sharp ; internal appendage rather broad. 



Broderip, Trans. Zool. Soc. vol. i. p. 197. pi. 37. f. 3. 



Ilab. Lord Hood's Island, the Galapagos and Island of 

 Muerte, Bay of Guayaquil (on the reefs) ; Cuming. 

 Ii\ all its variations this species is contracted at the 



margin on the side next the vertex. 



December, 1858. 



