298 



D i e s i II ff. 



postic'us. M;iricoliie hemisphaerae borealis, rarissime australis '). 

 Formae mediocres vel majores aliquot lineas longae, polllcares, imo 

 pedales. 



Evolutio in nonnullis saltem speciebus via nietamorphosis. 



* Ocel li du 0. 



1. Nemertes carcinophila KöLLlKER. 



Corpus siibcylindricum depressiusculum pallide auratitiacum. 

 Proboscis piigione unico armata haiid vaginata. OcelU 2 elliptici. 

 Longif. 1—3'". 



Nemertes carcinopliilus Kölliker : in Verhandl. d. Schweiz, naturf. Ge- 

 sellscb. in Cliur 18U. Chur 184S. 89. — Excerpt. Siebold: in Tro- 

 schel's Arch. iSäO. II. 382. 



Habitaculum. Inter aeervos ovulorum Canceris brachyuri 

 prope Messinam (Köllikei). 



2. Nemertes I microcephala 0£:Ä-Srj5:i). 



Corpus lineare utrinque pauitiliim angustatum, obtusum, sub- 

 pellueidiim, fusco-grisescens. Caput parviim siibreniforme. Pro- 

 boscis . . . Ocdli 2 pone margiiiem anteriorem. Longit. 8'". 



Nemertps? microcephala OerÄ^ec?; in Kroyer's Naturhist. Tidsskr. I. 

 1844— i843, 418. 



Habitaculum. In profunditate niaris 40 orgyiarum prope 

 Dröbak in Norvegia (Oersted). 



" Ocelli 4, 6-8. 



3. Nemertes socialis LEIDY. 



Corpus lineare depressum, postice obtusum v. sul)acutum, supra 



nigrum, subtus fusco-ciiiereuii), iiiterdum totiim fusco-cinereum. Caput 



corpore continuum, subaeiituiii, interdiim apice nigrum. Proboscis... 



Ocelli 4 — 8 per paria posfposita dispositi. Longit. ad 6", latit. 1/3'". 



Nemertes socialis in Journ. Acad. Pliilad. 2 ser. III. H. 



Habitaculum. Abiindp ad radices Corallinarum, Point Judith 

 in America septentrionali (Leidy). 



4. Nemertes rufa DIESING: Syst. Helm. i. 271. 

 Habitaculum. Christianssund in Norvegia (Hathke). 



5. Nemertes pasiila OERSTED.— Dies. Syst. Helm. I. 27t adde: 



Oersted: De region. marin. 80. 



*) Nemertes pachyrhyocha et N. poliophthalma Seh mar da. 



