446 Miscellaneous. 



less than one half of the length of the head. Epidermoid 

 productions rudimentary, lanceolate, obliquely arranged, im- 

 bedded in the skin. Anal higher than dorsal. 



Blackish brown. 



Off Inosima. 



Nettastoma jparvicejps. 



Head small, its length being two fifths of the distance 

 between the gill-opening and vent (more than one half in N. 

 melanurum). Dorsal fin commencing in advance of the gill- 

 opening. In other respects similar to the Mediterranean 

 species. 



South of Yeddo. 



MonacantJius modestus. 

 D. 36. A. 34. 



Skin velvety, without spines or bristles on the tail ; the 

 height of the body is contained twice and three fourths in 

 the total length (without caudal) 5 upper profile of the head 

 convex, the gill-opening extends downwards to the level 

 of the middle of the root of the pectoral ; the dorsal 

 spine is inserted above the posterior third of the eyej it 

 is scarcely half as long as the head, or as its distance 

 from the second dorsal fin ; it is armed with four series 

 of very small barbs, the two front series being very close 

 together; the anterior half of the dorsal and anal fins 

 elevated, somewhat higher than the dorsal spine ; ventral 

 spine fixed. 



Uniform brownish grey ; caudal blackish, with the inter- 

 radial membrane whitish and without any cross bands. 



Inland Sea. 



MISCELLANEOUS. 



M. K. A. Zitfel on Fossil Heccactinellida. 



To tlie Editors of the Annals and Magazine of Natural History. 



Gkntlemen, — Permit me to correct a slight mistake that has 

 crept into Prof. Zittel's diagnosis of the scheme I adopted m the 

 year 1870 * for the natural subdivision of the then known Hexac- 

 tinellid sponge-forms, and which error is reproduced in Mr. Dallas's 

 translation in the last number of the 'Annals.' Of the two groups 

 of the " CoraUiospongia " and " Calicispongia " then instituted by 

 me, it was the former of the two that was made to embrace all 

 those species distinguished by the possession of an " anastomosing 



* ' Monthly Microscopical Journal,' vol. iv. p. 252, 1870. 



