6o8 ORDER HETEROTRICHA. 



with by tliem. The surfoce of the exceedingly thick and massive lorica, while 

 seeming to be simply granulate under a magnifying power of 300 diameters, is 

 shown, when still further enlarged, to be ornamented with hexagonal facets in a 

 manner corresponding with that of T. dcnticidatus, though on a much finer scale. 



Tintinnus lagenula, C. & L. Pl. XXXI. Figs. 21 and 22. 



Lorica broadly flask- or helmet-shaped, nearly as wide as long, with a 

 very short and slightly narrower everted neck, and inflated body-portion ; 

 posterior region verrucose and opaque, divided into somewhat coarse poly- 

 gonal areas or facets, the anterior end smooth and diaphanous ; extended 

 animalcule nearly equal in length to the lorica, two zooids sometimes 

 inhabiting the same domicile. Length of lorica 1-80". 



Hab. — Salt water : Norwegian coast (C. & L.). 



The contour of the lorica of this species, combined with the verrucose and 

 facetted aspect of its posterior region, coincides remarkably with that of Coilotiellci 

 galea, Hkl., described later on. As seen with a magnification of 700 diameters, 

 each of these polygonal facets exhibits a central spot which Clapar^de and Lach- 

 mann are disposed to regard as a perforation. A similar formation, as represented 

 in the lorica of CodaieUa galea, is interpreted by Haeckel as due to the enclosure 

 within each facet of a minute siliceous corpuscle. 



Tintinnus cinctus, C. & L. Pl. XXXI. Fig. 10. 



Lorica cylindrical, slightly opaque, everted at its anterior margin, about 

 three times as long as broad, terminating posteriorly in an elongate, often 

 recurved point ; the whole surface ornamented with widely separated trans- 

 verse annulations. Animalcule unobserved. Length of lorica 1-200". 



Hab. — Salt water : coast of Norway. 



The possible identity of this type with the Codonella orthoceras of Professor 

 Haeckel receives attention in the description given of that species. 



Tintinnus cothumia, Ehr. 



Lorica cylindrical, diaphanous, attenuate and truncate posteriorly ; 

 transversely but indistinctly annulate throughout. Length of lorica 1-440". 

 Hab. — Fresh water : Baltic Sea. 



This species is described by Ehrenberg in company with T. denfiailatus in the 

 ' Monatsbericht d. Berliner Akademie,' p. 201, 1840. Its nearest ally would appear 

 to be the Tintinnus cituius of Claparfede and Lachmann. 



Tintinnus helix, C. & L. Pl. XXXI. Fig. 24. 



Lorica cylindrical, four times as long as broad, slightly opaque from the 

 incorporation of minute granular particles ; grooved or sulcate posteriorly 

 in a spiral or helicoidal manner, the anterior extremity transversely 

 annulate ; the distal margin even, not everted, the opposite or posterior 

 end terminating in a short and often slightly recurved point. Animalcule 

 unobserved. Length of lorica 1-165". 



Hab.— Salt water : Norwegian coast (C. & L.), 



