476 GLYCERIDJE. 



containing hemoglobin, which were regular in form in Glycera sirjlwno stoma. Similar 

 results were attained by Kollmann, who further found the corpuscles containing 

 hemoglobin dividing karyokinetically in Glycera convoluta. 

 Grube, in 1870, thus groups the Glyceridae : 



1. Glyceridae with branchiae. 



A. Branchiae of the upper edge of the foot situated near the tip — a simple or clavate 



process. The two anterior lamellae of the foot elongated. 



(a) The upper posterior lobe resembling the anterior, the inferior shorter. 

 Branchiae simple. 

 G. alba, H. Rathke ; G. convoluta, Kef. 



B. Both hind lobes short and blunt; only a small papilla present. 



Foreign species. 

 G. Branchiae situated on the anterior border of the foot. 



(a) Branchiae simple. 



G.fallax, De Quatref. 



(b) Somewhat forked, simple; lobes triangular, the anterior longer. 



G. unicornis. 



(c) Branchiae branched. 



Foreign sp., e.g., G. dibranchiata (Massachusetts Bay). 



2. Glyceridae without branchiae. 



A. Foot with two anterior lobes, and only one broad posterior lobe. 



G. capitata. 



G. gigantea ( = G. siphonostoma, D. Ch.), De Quatref. Anterior segments 

 longer than the rest, the middle third as broad as long. Body 1 foot long, 

 300 segments. Anterior lip of foot with blunt tip ; posterior upper lip 

 short, triangular, the inferior less, shorter, bluntly rounded. Papillae of 

 proboscis digit-like, blunt. 



G. decor uta, De Quatref. Foot similar, anterior lip pointed, hind lip short and 

 high, anterior segments shorter than in G. gigantea. Papillae of proboscis 

 fringe-like, oval, or clubbed. 



Grube (1878) characterizes the family Glycerea (Gr.) as having a conical head-lobe 

 of many annuli. Tentacles and subtentacles two, short; sometimes none, often two 

 obtuse short tentacular organs posteriorly; no eyes. Body long or short, vermiform, 

 rounded, with numerous biannulate segments ; two anal cirri. No blood-vessels. 



Buccal segments several ; the first long, naked, the rest bear feet. Proboscis clavate 

 or sub-cylindrical, with minute papillae, often with a circle of larger ones at the orifice. 

 Jaws two or four, sometimes with intermediate paragnathi, anterior and basilar. Branchiae 

 fixed to walls of pinnae, often retractile, simple sacs or bifurcate, rarely ramose, or none. 

 Feet uni- or biramous, with dorsal and ventral cirri, the former minute, papilliform, 

 inserted above the base of the foot. Bristles simple and compound. 



A careful account of the proboscis of Glycera convoluta, Kef., was given by C. Gravier 



