eitter: octacnemus. 251 



Rectal 'portion of the intestine projecting considerably beyond the visceral 

 mass, the anus directed backward and upward. 



These specific differences will be readily seen by comparin.G; Figures 1 and 2, 

 Plate 1, with Figures, 2 and 1 respectively, Plate 10, of Herdman's Report 

 (1888) ; these latter being copies of Moseley's figures. 



Abbreviations. 



a anus. 



ad adhesive patch. 



at atrial orifice. 



at. c atrial eliamber. 



hr branchial orifice. 



hr. s branchial stigmata. 



c.b.s cavity of branchial sac. 



d.l dorsal lamina. 



d.t dorsal tubercle. 



ec ectoderm. 



en endostyle. 



en./, endostylar fold. 



A. m " horizontal membrane." 



int. b intestinal band. 



m membrane together with the epithelium 



lining the atrial chamber. 



m. h., m. h'., m. b"., muscle bands. 



m. r radial muscles. 



n anterior nerves. 



n. g nerve ganglion. 



n. z nucleated zone. 



n. n. z non-nucleated zone. 



o.br opening into branchial sac by dissection. 



oe oesophagus. 



ov ovary. 



p. b.b peripharyngeal band. 



r.n raplieal nerve. 



s. gl subneural gland. 



St. in stomach-intestine. 



t test. 



tes testis. 



v.f. ventral flange. 



