ZOOLOGY OF FERNANDO NOEONHA. 



529 



The right aud left moieties of the male copulatory apparatus 

 held together in front by a triangular plate. Below this plate 

 terminates in a rounded apex, which extends as far as the inferior 

 margins of the halves of the apparatus. Each upper augle of 

 this plate produced laterally and upwards into a relatively 

 slender bar, which curves round the superior portion of the 

 anterior lamina of its side. Each anterior lamina simple, more 

 oi* less spatulate, with evenly rounded external margin and 

 slightly concave inferior margin. Viewed from the side, seen 

 to be considerably thicker above than below. Posterior lamina 

 irregularly quadrate, with even outer and inner margins which 

 below slightly converge ; the inner margin distally produced 

 into a conspicuous rounded, noduliform process, which projects 

 slightly below the level of the concave inferior margin of the 

 anterior lamina, and is consequently visible when the copulatory 

 apparatus in its entirety is viewed from the front. Above and 

 externally, the interspace between the anterior and posterior 

 laminae is occupied by a small sclerite, with even margins and 

 rounded below, which, dilating above, forms the posterior margin 

 of the superior aperture of the sheath, of which the walls are 

 composed of the four laminae just described, and which contains 

 the protrusible portion of the copulatory apparatus. This pro- 

 trusible portion is articulated at its proximal end to a simple 

 rod, which is itself articulated to the upper extremity of the 

 anterior lamina. Protrusible portion curved almost through the 

 arc of a semicircle, and composed of two segments. The distal 

 segment about twice as long as the proximal, membranous and 

 hollow behind, chitinous in front, with its posterior portion armed 

 with a simple small process. 



A dozen specimens found under stones in the Banana planta- 

 tions at the base of the Peak. 



In many points this species appears to resemble Sj). paraensis 

 (Humb. & Sauss.). But the absence of all knowledge of the form 

 of the copulatory apparatus of that species makes it impossible 

 for me to refer these specimens to it. 



