294 I) i e s i n g. 



23. Tetrastenima serpentina GIRARD: 



in Keller et Tiedemann's N.Amer. Monatsber. II. 18S1. 1. — Stimp- 

 snn : in Smith son's Contrib. VI. 28. 



Habitaculum. Massuchiisetts (...): Grand Manoii (Stimps.). 



24. Tetrasteinma elegans SCHMARDA. 



Hecate elegans Girard: in Proceed. Bost. Soc. nat. bist. IV. (1852) 185. 

 Tetrastemma elegans Schmarda: Neue wirbell. Tb. I. 1. 38. 



25. Tetrastemma Rrohnii. 



Corpus filiforme depressiusculum, griseo-virescens. Proboscis 



armata, haud vagiiiata. Ocelll 4, in quadrangulum dispoüiti. Longit. 2'". 



Nemertes Krobnii KöUiker : in Verhandl. d. Schweiz, naturf. Versamml. 



Chur, im Juli 1844. Chur 1845. 89. — Siebold: in Troschel's 



Arch. 1850. II. 382. 



Habitaculum. Inter plantas marinas in fretu Messinae (Köl- 

 liker). 



26. Tetrastemma Ehrenbergii. 



Corpus filiforme depressiusculum, obscure viride. Proboscis 

 armata band vaginata. Ocelli 4. Longit. 4 — 5. 



Nemertes Ehrenbergii KöUiker: in Verhandl. d. Schweiz, naturf. Gesell- 

 schaft zu Chur im Juli 1844. Chur 1845. 89. — 5jeSo;</; in Troschel's 

 Arch. 1850. II. 382. 



Habitaculum. Iiiter plantas marinas in fretu Messinae (Köl- 

 liker). 



27. Tetrastemma roseum. 



Corpus depressiusculum roseum. Proboscis armata. haud vagi- 

 nata. Ocelli 4 in quadrangulum dispositi. Longit. 3 — Si/j'". 



Nemertes roseus KöUiker: in Verh. d. Schweiz, naturf. Gesellsch. Chur, 

 Juli 1844. Chur 1845. 89. — Siebold: in Troschel's Arch. 1850. 

 II. 382. 



Habitaculum. Inter planfas marinas in fretu Messinae (Kol- 

 li ker). 



Situs cephalopororum in speciebus 25., 26. et 27. et dispositio ocellorum 

 in specie 26. in excerpto saltem non indicantur; acta soc. nat. scrut. 

 helvet. in bibliothecis publicis frustra quaesivi. 



LXin. DITACTORRHOCHMA DIESING. 



Corpus elongatum proteum. Caput a corpore discretum sub- 

 triangulare. Cephnlopori duo ventrales, transversales, juxtapositi, 



