242 SURCULA. 



S. OWENII, Gray. PL 7, fig. 91. 



Whorls encircled by a row of compressed tubercles at the 

 periphery, and a smaller one beneath the suture ; below the 

 periphery granulated by the intersection of fine revolving riblets 

 and close curved growth costae ; cream-brown or nearly white, 

 often orange-tinged at the extremity of the spire. 



L. 30, diam. 11 mill. 



Australia. 

 S. QUOYI, Reeve. PL 7, fig. 95. 



Shell yellowish brown, with a double row of small, compressed 

 nodules on the periphery, above which the surface is slightly 

 concave to a subsutural, slightly nodulous band, which is 

 regularly square-spotted with chestnut ; lower part of body- 

 whorl with revolving, fine ridges and striae. 



L. 28, diam. 12 mill. 



Australia. 



With this species Reeve and Weinkauff unite P. monile, Yal. ; 

 it appears to me more nearly related to the group Perrona. 



The following species of Surcula have been described by Rev. 

 Robert Boog Watson in the " Mollusca of the Challenger 

 Expedition." They have not been figured. 



P. STAMINEA, Watson. Kerguelen, Prince Edward IsL, etc. 



P. TRILIX. Watson. Kerguelen and Heard Isl. 



P. LEPTA, Watson. Southern Ocean, Southeast of Australia. 



(Resembles P. clara, von Martens, from Patagonia.) 

 P. ROTUNDATA, Watson. Pacific, East of Japan. 



P. GONIODES, Watson. Southeast of La Plata. 



(Resembles in a general way P. circinata, Dall.) 

 P. PLEBEIA, Watson. Off' Pernambuco. 



(Something like P. nodifera, Lam.) 



P. SYNGENES, Watson. Off' *S7. Thomas, West Lid in*. 



P. HEMIMERES, Watson. Pernambuco. 



P. ANTERIDION, Watson. < )ff' Cape of Good Jl 



P. RHYSA, Watson. Pcrn<n ! 



P. BOLBODES, Watson. Pernambuco. 



P. ISCHNA, Watson. Northeast from New Zealand. 



(Resembles P. emendata, Monterosato, of the Mediterranean. 





