474 GLYCERID.E. 



GrrubeV seventh family, Grlycerea, held both Grlycera and Goniada, and he pointed 

 out the correspondence of the proboscides of these with those of the NephthydidaB and 

 Phyllodocidae. 



Levinsen (1883) places the Grlyceridas as the second family of his Enniciformia 

 G-lycerma, the second division of the Euniciformia. Benham includes the family under 

 his Nereidiformia. 



G-ravier 2 is of opinion that the rings of the prostomium in this group are superficial 

 and only affect the epidermis, and thus they correspond with the condition in other 

 annelids. 



Goodrich 3 holds that Ehlers misinterpreted the exact structure of the segmental 

 organs (Figs. 91 and 92) in Glycera— which consist of a segmental organ, the ciliated 

 organ, and a segmental sac. The organ opens to the exterior by a minute pore outside 

 the large bundles of ventral longitudinal muscles. The pore leads to a slender canal 

 which passes through the body-wall to the septum, pierces it, and joins the segmental sac. 

 He thinks the ciliated organ and sac gather up through phagocytes the waste products 

 in the ccelom (with which there is no direct communication), whilst the purpose of the 

 segmental organ is to eliminate solid excretory matter from the ccelomic fluid. The 

 function of the solenocytes is possibly analogous to the Malpighian capsules of vertebrates, 

 viz., to excrete liquid. Fage 4 terms the ciliated organ the cilio-phagocyte organ, and it 

 is always attached to the nephridium. The nephridial mass in close contact with the 

 ciliated organ is divided into a multitude of minute canals, and the surface is hirsute with 

 a peculiar form of solenocyte. The organ, which is globular in shape, is remarkably 

 developed in Glycera svphonostoma, and in section it is elaborately reticulated. The 

 ciliated organ is a simple fold of the peritoneal epithelium which covers the dissepiment. 

 In Glycera alba, H. Ratlike, the nephridial mass forms three lobes, each with solenocytes. 

 It is held that the segmental organ does not transmit the genital products. 



Dr. Thomas Williams (1852) pointed out the nature of what he called the " chyl- 

 aqueous fluid" in Glycera alba, and mentioned that in this form cilia occurred internally 

 at the base of the feet. He combated the opinion of De Quatrefages that the perivisceral 

 fluid was always circulated by vibratile cilia. He states that the ccelomic fluid is colour- 

 less, but that the corpuscles are blood-red, whereas " the true blood conforms with 

 the annelidan law of perfect fluidity : it bears no visible elements, and is light red in 

 colour." 



Kinberg 5 termed the upper tentacles " antennas," the lower " palpi." He distin- 

 guished for purposes of classification the lateral pharyngeal papilla?- from the terminal 

 (between and in front of teeth), and he separated his "ovaria" ( = branchiae, And. and 

 Edw. ; " Kiemen," Grube) from his branchiae (=lingulse), the modified terminal regions 

 of the ventral cirri. 



1 Tarn. Aimel./ p. 59, 1851. 



3 < C. R. Ac. So./ t. cxxvi, p. 972, 1898. 



3 ' Quart. Jo urn. Micr. Sc,/ vol. 41, pp. 439—457; and ' I ate mat. Congress Zool./ Cambridge, 

 1899, p. 196. 



4 Ami. So. nat., 9 e ser., t. iii, p. 297, 1906. 



5 'Of vers. af. k. Vet.-Akad. Fork/ No. 2, p. 244, 1865. 



