440 



DR S. F. HAEMER AND DR W. G. RIDEWOOI) ON THE 



(06) RIDEWOOD, W. G., "A New Species of Cepltalodiscus (C. gilchriati) from the Cape Seas," Marine 



Investigations, South Africa, iv., Cape Town, 1906, pp. 173-192, three plates and five text-figures. 

 (07 1 ) " Pterobranchia : Cephalodiscus," National Antarctic Expedition: Natural History, vol. ii., 



London [Brit. Mus.], 1907, pp. 1-67, seven plates and seventeen text-figures. 

 (072^ On the Development of the Plumes in Buds of Cephalodiscus," Quart. Journ. Mier. Sri., 



N.S., li., 1907, pp. 221-252, eleven text-figures. 



(12) "On Specimens of Cephalodiacus nic/rescens supposed to have been dredged in 1841 or 1842," 



Ann. Mag. Nat. Hist. (8), x., Nov. 1912, pp. 550-555, one text-figure. 

 (05) SOHEPOTIEFF, A., " Zur Organisation von Cephalodiacus," Bergens Museums Aarbog, 1905, No. 8, 



pp. 20, two plates. 



(07) "Die Pterobranchier : Anatomic von Cephalodiscus," Zool. Jahrb., Abth. filr Anat., xxiv., 1907, 



pp. 553-608, eleven plates. 



(08) " Die Pterobranchier : Knospungsprozess von Cephalodiscus, und vergleichend-anatomischer Teil," 



Zool. Jahrb., Abth. filr Anat., xxv., 1908, pp. 405-491, four plates. 



(09) "Die Pterobranchier des Indischen Ozeans," Zool. Jahrb., Ablh. fur Systematik, xxviii., 4, 1909, 



pp. 429-445, two plates. 

 (12) SPENGEL, J. W., "Pterobranchia," in Handwi'irterbuch der Naturwissensch often (Korschelt and others), 



vii., 1912. 



LIST OF REFERENCE-LETTERS. 



an., anus. 



b.c. 1 , proboscis-cavity. 

 b.c. z , collar-cavity. 

 b,c?a., anterior dorsal horn of collar-cavity. 



b.c. s , metasomatic cavity. 



b.c. 2 b., part of metasomatic cavity in loop of ali- 

 mentary canal. 

 c.c., collar-canal. 



c.c.i., internal opening of collar-canal. 

 c.n.s., central nervous system. 

 d.m. z , dorsal mesentery of collar. 

 dm. 3 , dorsal mesentery of metasome. 

 g.s., gill-slit. 

 int. , intestine. 

 L^-L. 9 , left arms. 

 l.n., lateral nerve. 

 m., mouth. 

 ms., longitudinal muscles of metasome. 



nch., notochord. 

 n.t., nerve-tract. 



op., operculum or postoral lamella. 

 op.l., left lobe of operculum. 

 op.r., right lobe of operculum. 

 op.rec., recess at base of operculum. 



p., proboscis. 

 per., peristome. 

 ph., pharynx. 

 p.p., proboscis-pore. 



?., rectum. 

 R^-R. , right arms. 



st., stalk. 

 ftom., stomach. 



t., testis. 

 t.L, left testis. 

 t.r., right testis. 

 i:.m.~, ventral mesentery of collar. 



(ROY. 8OC. EDIN. TKANS., VOL. XLIX., 5(>4.) 



