368 



Plate II. 



Fig. 1 a. 



— 1 b. 



— 2 a. 



— 21). 



— .■) a. 



— .il). 



— 3 c. 



— 4 a. 



— 4 1) 



— 6 a. 



— 7 a. 



— 71). 



— 7cl. 



— 7e. 



Mcnipea cnjslallina (Gray). Two occcia sur- 

 rounded by kciiozooscia are seen in the 

 pro.ximal intcrnodc. X 40. 

 The same species. A longitudinal section 

 through a gonozocecium, an oa'cium and 

 a surrounding kenozoojciuni. X .')5. 

 A portion of Menipea cyallms Wyv. Th., 

 from the basal surface. X 40. 

 .•\ longitudinal section through a zo(Tcium 

 of the same species. The distal wall with 

 rosette-plates is .seen. X 40. 

 A portion of Menipea Biiski Wyv. Tli The 

 distal zod'cium covers an endozoiecial oie- 

 cium, the distal part of which is covered 

 by a granular cryptocyst. X 40. 

 A portion of the same species from the 

 basal surface. X 40. 



A longitudinal section through a zotEcium 

 of the same species with oo-cium. X 5.'). 

 .\ jjortion of Menipea cervieornis Mac (lill.). 

 The distal zoa'cium covers an endozooecial 

 oa'cium, the distal part of which is covered 

 by a granular cryptocyst. X 40. 

 .\ longitudinal section through a zocecium 

 of the same species with oa'cium. X 55. 

 -f. A series of dcvclo])mental stages of the 

 occcium o( Scnpocellaria scabra y. lien.). The 

 oblique frontal part of the distal wall 

 is seen proximally to the developing ott- 

 cium. X .'i.'i. 



C.aberea F.llisi (Flem.). The proximal zo(K- 

 cium with rudiment of oa'cium. X 40. 

 Menipea rohorala (Hincks), with oa-cia. The 

 proximal jjart of the ectooa'cium is uncalci- 

 iied whereby a triangular area is formed. 

 The horizontal part of the distal wall (d. w.) 

 is visible. X 40. 



The same species without ooecia. Three of 

 the zoa'cia which show only a single avi- 

 cularium have an internal avicularium (plac- 

 ed in the cavity of the zoteciumi; this avi- 

 cularium is attached just inside the small 

 area beside the external avicularium. X 40. 

 The same species. The proximal end of a 

 zocEcium with a single external avicularium. 

 The ends of two interior robust spinous 

 processes arc seen in the pro.ximal portion 

 of the frontal area. X 75. 

 The proximal half of a zoa;cium from the 

 basal surface after the removal of the 

 latter. An internal avicularium. four spin- 

 ous processes and the horizontal part of 

 the distal wall with its pore-chamber are 

 seen. X 75. 



The proximal half of another zoa'cium trea- 

 ted in the same way. The mandible of the 

 avicularium has been removed. X 75. 



Fig 7 f. .Some zooecia of the same species from the 

 basal surface. The internal spinous pro- 

 ce.s.ses, the pore-chamber of the distal wall 

 and the heart-shaped rosettc-plale arc seen. 

 X 40. 



— 7 g. Some zoa-cia of the .same species, lateral 



view. The bent distal wall, the internal 

 avicularium (a. v.) and a robust forked i)ro- 

 cess are visible. X 55. 



— 7 b. Some marginal zoa-cia of the same species, 



lateral view. Two radical libres are seen 

 to originate from their chambers &e. X 40. 



— 7 i. An external avicularium of the same spe- 



cies. X 55. 



— 7 j. An internal avicularium of the same spe- 



cies, lateral view. X 75. 



— 7 k. The same avicularium without mandible, 



from the frontal surface. X 75. 



— 8a. Menipea ligulata Mac dill.. X 40. 



— 8 b. The same species from the basal surface. 



The pore-chamber and the rosette-plate of 

 the distal wall are seen. X 40. 



— 8 c. Some zooecia of the same species, lateral 



view. The distal wall with its pore-cham- 

 ber is seen and the peculiar internal pro- 

 cesses, which are j)ointed in the zoa'cium 

 with ooecium and furnished with an ex- 

 panded, dentated terminal part in the 

 others. X 40. 



— 8 (I. A distal wall of the same snecics with a 



heart-shaped rosette-plate and two pore- 

 chambers. X 200. 



— 8 e. Some of the internal processes, more highly 



magnified. X 75. 



— 9 a. Canda araehnoides (I.amx.). The oa'cia are 



inclosed in avieularia. X 40. 



— 10 a Hoplitella armata (Busk). X 2."?. 



— 101). The same species, from the basal surface. 



The proximal part of the zoa'cia is fur- 

 nished with two long lateral expansions, 

 but only with a single one in the mar- 

 ginal zocecia. X 23. 



— 10 c. The distal wall of the same species, fi'om 



the proximal end. On each side is seen 

 the transverse section of an expansion. 

 The occlu.sor muscles of the operculum 

 are al.so seen. X 55. 



— 10 d. A longitudinal section through a zocecium 



of the same s])ecies. The bent distal wall 

 (d. w.) and one of the expansions are seen. 

 X 40. 



— 10 e. .\ longitudinal section through a marginal 



zo(eciu])i of the same species. The internal 

 aspect of the avicularium a. v.) and the 

 strong marginal thickening, which sur- 

 rounds the ro.sctte-i)lates, are seen. X 40. 



