494 DESCRIPTION OF A PARASITIC STNGNATUS, 



surface, while here they are as conspicuous as on any part of the 

 test. Temnopleurus Reynaudi has a conical outline and the pits 

 are different. In T. tornematiciis, the secondary tubercles form 

 oblique lines and the portion of the ambulacral plates which lies 

 between the sutural cavities has a band-like character. 



From all these circumstances I regard the urchin here figured 

 as new, I do not think we are dealing with a very young stage, 

 but as I cannot give any information or surmise about the adult 

 state, I name the species only provisionally and distinguish it as 

 Temno^ leurus cavernosa . 



Description of a Parasitic Syngxatus. 

 By E. P. Eamsay, F.L.S., &c, 



SyNGXATUS INTESTIXALIS, Sp. 710V. 



Operculum with a ridge. Body elongate, quadrilateral, with 

 four distinct ridges, lateral line ridged, almost confluent with the 

 upper ridges of the tail ;* dorsal ridges of the body ending with 

 the dorsal fin, which is composed of thirty rays, rather high, 

 and occupies five of the caudal and half of the last body ring. 

 Body rings sixteen, nuchal ridge on three nuchal plates, the 

 dorsal ridge overlaps the caudal at the dorsal fin, and ends with 

 the last dorsal ray ; the lower caudal ridge continuous with the 

 abdominal ; the tail about half as long again as the body, the 

 anus in front of the dorsal, each ring ending in a small, sharp, 

 spine ; the folds of the egg pouch in the male occupy about 

 one third of the extent of the caudal j)ortion ; the snout is very 

 slightly shorter than the remainder of the head, the width of the 

 head at the gill covers is one third of the head — including the 

 snout. 



Body flesh colour, dorsal ridges and caudal fin orange, fourteen 

 to sixteen dark bands on the body very indistinct on the under 



