14 THÉEL, NORTHERN AND ARCTIC INVERTEBRATES. II. PRIAPULIDS, ECHIURIDS ETC. 



* Bristles absent. 

 ** Genital setse absent and 

 substituted by two prominent papilhf. 



Hamingia Danielssen and Koren 1881. Frontal hood narrow, simple trough-like 

 (Ray Lankester) or sligthly bifurcate (Skorikow). A pair of uterine pouches. 

 Cloacal appendages divided in branches. Shape of the body cylindrical. 



H. arctica Danielssen and Koren 1881. 



"' ; Genital seta; present. 



TJialassema Gaertner, Pallas 1774, Cttvier 1830. 1 Frontal hood simple, narrow. Often more 

 than two pairs of uterine pouches or segmental organs. Cloacal appendages simple sacs. 

 Shape of the body cylindrical. 



T. Neptuni (Gaertner, Pallas 1774), Cuvier 1830. 



Bonellia Rolando 1821. Frontal hood longer than the body itself, with a narrow 

 »trough-like stalk and a widely expanded caryophyllaceous anterior region» (R. 

 Lankester). Uterine pouch single. Cloacal appendages divided in branches. 

 Shape of the body subspherical or sacciform. 



B. viridis Rolando 1821. 



Sub-Order Saccosomatida. 



Frontal hood or preoral proboscis, tentacles, genital setee or papillse, bristles, 

 external anal appendages, interna! rectal or cloacal appendages (nephridia) and retractor 

 muscles absent. Body cucurbit-like, tapering anteriorly, devoid of superficial longitudina] 

 and transverse ridges. Mouth and anus in opposite ends of the body. Intestinal canal 

 not straight, arranged in circumvolutions. A single uterine pouche (segmental organ) 

 opening close to the mouth. Genital gland unpaired, accompaning the nerve cord. 



Saccosoma Danielssen and Koren 1881. 



S. vitreum Danielssen and Koren 1881. 



1 Considering (hat this genus has béeri founcl lMng at the coasts of England, it seenis likely tliat it 

 niay be met with at the Scandinavian coasts too. 



