48 



of two sizes. The larger openings have an average diameter of 1,5 mm, but the smaller ones, which 

 are more numerous and are distributed between the larger openings, are about 0,75 mm in diameter. 



The gastral surface is smooth and exhibits numerous evenly distributed circular openings 

 about 0,75 mm in diameter. 



The main skeleton is composed of long, slender diacts with rough rounded ends which are 

 occasionally slightly swoUen and sometimes more or less pointed; they vary in size from 0,835 by 

 0,013 to 7,74 by 0,041 mm. 



The spicules of the dermal skeleton are: a) large, hypodermal pentacts with smooth tangential 

 rays about 22 mm long and proximal rays, reaching a length of 7,84 mm; b) rough autodermal pentacts 

 with rays averaging 0,16 mm in length and with a thickness near their bases of 0,013 mm; c) small 

 diacts with roughened ends bearing two or four central or subcentral tubercles and varying in length 

 from 0,28 to 1,37 mm with a thickness of about 0,02 mm. 



The gastral skeleton consists of : a) rough, autogastral h e x a c t s with rays having an average 

 length of 0,09g iTi™ with a basal thickness of 0,010 mm; b) diacts similar to those of the dermal 

 surface but with the central inflations more fully developed. 



Throughout the parenchyma are numerous oxyhexacts and oxyhexaster, which are seen to 

 be rough when viewed under a sufiiciently high power. Any one of the principal rays of the oxy- 

 hexacts may bear two long, straight, divergent, terminal rays, thus giving rise to the oxyhexasters, 

 so that all gradations between the six and twelve rayed spicules are seen. The length of the rays 

 of an average sized hexact is 0,049 wirn- Beneath the gastral surface and in moderately large numbers 

 are eight rayed discohexasters (? F. E. SCH.) of unusually large size having an average diameter of 

 0,262 mm ; each of the strong stout, principal rays bear four long, straight, slightly divergent terminals 

 ending in transverse discs. Distributed throughout the entire skeleton are numerous, minute disco- 

 hexasters, whose Short principal rays bear a variable number of exceedingly fine, slightly curved 

 secondary rays which terminate in small discs. The average diameter of these rosettes is 0,019 "^m. 



The writer desires to name this species after Mr. D. B. DOWLING, who was Dr. G. M. Dawson's 

 assistant during the summer 1885. 



Locality — Strait of Georgia, near Comox, Vancouver Island, in about 40 fathoms. One 

 specimen." 



Ich habe die Darstellung Lambe's deshalb im vollständigen Wortlaute hier wiedergegeben, 

 weil ich mich in der Beschreibung mehrerer mir vorliegender Spongien, welche ich derselben Species 

 zurechne, mehrfach auf Lambe's Worte zu beziehen haben werde. 



In der von Ijima jüngst in den Annotationes zoolog. japonenses, I, Vol. 53 gegebenen vorläufigen 

 Beschreibung einiger zu Staurocalyptus dowlingi Lambe gestellten größeren Stücke aus der Sagami- 

 Bai findet sich folgender Passus: „What constitutes one of the special characters of this species, is 

 the spiny nature of the gastral surface caused by numerous needle-like (parenchymal) diactins that 

 project their ends beyond the gastral surface. In the specimens examined by Lambe, these gastral 

 prostals seem to have been wanting." 



Unter den zahlreichen Acanthascinen der Albatross-Expedition, welche vor der kalifornischen 

 Küste erbeutet wurden, findet sich nur e i n nahezu vollständig erhaltenes Exemplar und einige größere 

 Bruchstücke, welche mit der vorstehenden Charakteristik und den betreffenden Abbildungen so weit 

 übereinstimmen, daß ihre Zugehörigkeit zu derselben Species keinem Zweifel unterliegen kann. Die 



