Fm.TON : THE RK.rRNT SPECIES OF SPONDYLUS. 337 



Maximum dimensions : Heiglit (umbonal to ventral margins), 

 61 mm. Width (anterior to posterior), 58 mm. Depth or dia- 

 meter, 35 mm. 

 Hab. ? 



Compared with the ordinary forms of ictericiis Reeve (tlie type of 

 that species is a worn specimen) our species is distinguished by its 

 variegated colouration, the closer disposition of the ridges, and the 

 finer spines. 



I have examined four specimens, two of which are flatter above 

 than the type, and have their sides compressed, probably owing to 

 situation during life. In addition, there are also two typical speci- 

 mens in the National Collection. 



37. — S. ieniiispinosus Sow. Thes. Conch., i., p. 421, pi. 87, fig. 37. 

 Conch. Icon., fig. 23 (not 5. tenuispina Sandberger (fossil). 

 Die Conchy. Mainzer Tert., 1863). 

 Hab. : Island of Zebu, Philippines (Cuming). 



The type specimen in the British Museum is the only one I have 

 seen of this species. 



38. — S. ramosus Reeve. Conch. Icon., pi. 14, fig. 51. Conch. Cab. 

 (2nd edit.), pi. 2, fig. 3. 

 Hab. : West Indies. 



The type, as figured by Reeve, has very frondose spines ; this 

 specimen I have been unable to find in the British Museum col- 

 lection. There are two specimens in the British Museum (Cuming 

 collection) similar to Reeve's figure, except that only one of them has 

 its spines slightly frondose. I consider ra>nosus may be simply a 

 yellow variety of ictericus with foliated spines. 

 39. — S. inilmtus Reeve. Conch. Icon., pi. 15, fig. 55. 



{=jiux Reeve. Conch. Icon., pi. 18, fig. 64). 

 Hat).? __ 



Group I. 

 40. — S. ducalis Bolten. Museum Boltenianum, 179S, p. 194. Conch. 

 Cab., vii., pi. 47, fig. 477 (not 476). Illust. Conchy!., pi. S, 

 figs. 2, 3. Thes. Conch., fig. 16. Conch. Icon., fig. 26. 

 Hab. : Indian Ocean (Chenu). Philippine Islands (Cuming). 

 In the 2nd edition of the Conch. Cab., Kiister gives on pi. 8a, 

 figs. I and 3, figures that probably represent iderkiis Reeve rather 

 than ducalis, the name under which they appear. 



S. ducalis var. laviarcki Chenu. Illust. Conchyl., p. 6, pi. 9, 

 figs. 3, 4. Thes. Conch., fig. 20 (not fig. 63). Conch. 

 Icon., fig. 30. 

 Hab. : Indian Ocean (Chenu). 



V 



