460 WALTER GARSTANG. 



EXPLANATION OF PLATE 28, 



Illustrating Mr. Grarstang's paper on " Some Bipinnarise 

 from the English Channel." 



Fig. 1. — Bipinnaria from Plymouth, viewed from right side, enlarged. 

 The specimen was preserved, but retained its natural form. All outlines 

 determined by the camera lucida. Ciliated bands. — a. b. Adoral band. 

 a. c. 0. b. Anterior (prse-oral) section of primitive circumoral band (= cepha- 

 lotroch of Lankester). p. c. o. b. Posterior (post-oral) section of same 

 (= brauchiotroch of Lankester). Ciliated arms on the anterior (prse-oral) 

 baud. — p. V. a. Prse-oral ventral arm. r. a. v. a. Right anterior ventral arm. 

 Ciliated arms on the posterior (post-oral) band. — p. d. a. Prse-oral dorsal 

 arm. r. a. d. a. and I. a. d. a. Right and left anterior dorsal arms, each 

 bifid, r.p. d. a. and I. p. d. a. Right and left posterior dorsal arms, r.p.l.a. 

 andl.p.l.a. Right and left posterior lateral arms. r.p. v. a. Right posterior 

 ventral arm. a. Anus. m. Mouth, p. e. Prse-oral enterocoele. r. e. Right 

 lateral enterocoele. x. Morphological apex of prse-oral lobe. 



Fig. 2. — Diagram of same from ventral side, to show the course of the 

 ciliated bands. Letters as above. 



