616 PEOF. W. A. HEEDMAN S EEVISED 



C Branchial sac with papilliform connecting-ducts in its interior. 

 1 i Tylobranchion. 



( Branchial sac not papillated* 2 



n /Stomach smooth-walled 3 



I Stomach-wall thickened 4 



(Horizontal membranes denticulated to form projections between the 

 stigmata Glossophorum. 

 No such projections formed 5 



K / Intestinal loop simple, U-shaped Aplidiopsis. 



[Intestinal loop twisted 6 



„ f Systems simple Polyclinum. 



I Systems compound Aurantium, 



^ /Atrial aperture on the dorsal edge 7 



[Atrial aperture on the anterior end 8 



-/ Sand-grains imbedded in and incrusting test ... Fsammaplidiuin. 



[Test not containing sand-grains Aplidium. 



c /Branchial aperture 8-lobed 9 



[Branchial aperture 6-lobed 10 



Q r Wall of stomach folded or grooved 11 



[ Wall of stomach areolated or with grooves broken up 12 



jj r Systems simple Circinalium. 



[ Systems compound 13 



1 o r Postabdomen slightly pedunculated Fragariumt. 



[ Postabdomen not at all pedunculated Fragaroides t. 



r Postabdomen separated from abdomen by constriction. 

 12 j Parascidia. 



[ Postabdomen not separated off by constriction ... Morchellioides. 



,Q [Wall of stomach folded or grooved 14 



[ Wall of stomach areolated 15 



, . /Wall of stomach folded transversely Atopogaster. 



[ Wall of stomach folded longitudinally 16 



-./. / Postabdomen separated oflF by a constriction Polyclizioides. 



[ Postabdomen not separated off by constriction 17 



^n /Atrial aperture 6-lobed Sigillina. 



[ Atrial aperture with a languet Amaroucium |. 



1 f- / Postabdomen separated off by constriction Sidn3nini. 



[ Postabdomen not separated off 18 



-,(,( Systems simple Synoicum. 



[ Systems compound HMorclielliuni. 



Phaetngodictton, Herdman, 1885. 

 Colony club-shaped, or consisting of a " head " (or ascidiarium) 

 placed on a short peduncle. 

 Si/stems inconspicuous. 



* In Glossophorum the so-called papillas are due to a denticulation of the 

 horizontal membranes. 



t These two are very closely related. 



J The subgenus Morchelliopsis of Lahille comes in here, but I do not see 

 that it can be separated from Amaroucium, The specific name of the single 

 species, " Morchelliopsis Pleyherianus Lahille," must, according to the laws of 

 nomenclature, be punctum, Giard. 



