6 THOS. H. MONTGOMERY, 



or 5 ocelli form a straight line, deflected medially ; the anterior group 

 of ocelli is placed anterior to the cephalic cleft. The posterior group 

 of each side, situatcd behind this cleft, consists of two nearly parallel 

 rows of ocelli, the posterior ends of which are directed inward ; the 

 anterior row on each side consists of 5 ocelli, placed in a straight 

 line, and these ocelli are larger than those of the posterior row. 



This new species being unique in having the lateral chord com- 

 missure situated ventrally anterior to the posterior terminatiou of the 

 rhynchocoel and blood vessels, and in having 5 unpaired, ventral 

 diverticula of the rhynchocoel, has occasioned me to consider it as 

 representative of a new genus, Proneurotes (the name having reference 

 to the anterior position of the nerve commissure). Proneurotes is 

 otherwise, except in the very small size of its blood vessels, related 

 to Ämphiporus. 



The Single specimen of this species I found among Hydroids on 

 a wtjoden railroad pier, about low tide level, at Sea Isle. 



3. Ämphiporus greenmani n. sp, 



The arrangement of the ocelli (Figs. 1 — 11) is characteristic for 

 this species, though, as the figures show, there is considerable Variation 

 in their number and distribution, irrespective of age. The ocelli are 

 rather large, usually 8 — 10 in number on each side of the head, 

 rarely 12 on one side (Fig. 3) ; posteriorly they do not extend to the 

 brain. In mature individuals two rows of eyes may usually be dis- 

 tinguished on each side of the head. Each anterior row is margin- 

 ally situated, extending from the tip of the snout, to a little behind 

 the cephalic cleft; the row is curved, sometimes more or less in 

 zigzag, and posteriorly curves inward. In general, the ocelli of each 

 anterior row may be said to be placed in a Single curved line, which 

 is posteriorly directed inwards; but quite frequently ocelli may be 

 present outside of this line, and at the posterior end of the latter 

 there is a tendency to the production of a little buuch of ocelli, or 

 of a transverse row of two or three ocelli (Figs. 1, 3, 6, 7, 10). The 

 posterior group of ocelli on each side lies behind the cephalic cleft, 

 and is usually separated by a short distance from the anterior group ; 

 it generally consists of an oblique row of from 2 to 4 ocelli, directed 

 backwards and inwards (Figs. 1, 2, 5, 6, 7, 9). Seidom are the 

 anterior and posterior rows coufluent (Fig. 2). In young individuals 

 the ocelli are fewer in number, and arranged in an irregulär line 

 along each side of the head (Figs. 8, 10, 11). Sometimes the arrange- 



