€12 A. E. Yerrill — Turhellaria^ Nemertina, and 



single, slender, acute, simple seta, and one spiniform aciculum, often 

 bent at top. 



Length, 10""" ; diameter, 3'°'". 



Syllis (Ehlersia) nitida, sp. nov. 



A small slender species with the dorsal cirri and cephalic appen- 

 dages slender and beaded with rounded aiuiuli, mostly 10-14, and 

 in length generally f to y^^ the diameter of the body, referred 

 to the subgenus Ehlersia because the upper compound setfe have 

 long linear blades, very unlike the lower ones. 



Head transversely elliptical, considerably broader than long, dis- 

 tinctly three-lobed in front ; posterior margin broadly rounded, eyes 

 6, black ; two posterior pairs, which form a short trapeze, are small, 

 nearly equal ; a pair of minute front eyes at bases of the palpi. The 

 palpi are large, broad-ovate, obtuse, rather longer than the head. 

 Tentacle, with about 11 regular rounded beads, is rather longer than 

 the palpi. Antennse ai-e similar, but shorter, with about 9 beads. 

 Upper tentacular cirri are a little longer than the tentacle ; lower 

 ones much shorter. 



The dorsal cirri are all similar and vary but little in length, the 

 largest ones being those along the middle of the body, where some 

 of them are about as long as the diameter of the body and composed 

 of 12-14 beads; they are slender and tapered, and very regularly 

 beaded with rounded annuli, mostly about as long as broad ; the 

 shorter ones are from ^ to f the diameter of the body, and with about 

 8 beads. The anterior dorsal cirri are about equal to the upper ten- 

 tacular cirri, and have about 12 beads. 



Setse are all compound anteriorly, slender, rather numerous ; 1 or 

 2 upper ones, all along the body, have long, slender, linear, nearly 

 straight blades with incurved tips, ratios 1 : 10-15, becoming longer 

 posteriorly ; the lower ones have much shorter lanceolate blades, 

 ratios 1 ; 3-4 ; there is no gradation between the two sorts. Back 

 of the middle the setse become larger and more differentiated ; the 

 blades of the lower ones are bidentate. 



Posteriorly there are usually two spiniform acute acicula, one of 

 which projects considerably. 



The oesophagus is long and slender, about twice as long as the 

 stomach ; its tooth is small, conic, close to the margin ; the edge is 

 indistinct, but appears to be finely denticulated. The stomach is 

 narrow-cylindric, covered with many very close rows of glands. 

 Color, in formalin, plain yellowish white. Length, 5™°^ ; diameter, 

 about 4™"\ Only one specimen was taken. 



