33 RAPHONEIS. 



ANALYSIS OF SPECIES. 

 f p S eudo- f Strise curved, the median shortened; valve 



raphe very broad, lanceolate . . . R. amphiceros. 



All beads , narrow, 



of equal ' linear ' btnae stral S ht - somewhat radiant ; valve 

 size. '. I linear or narrowly lanceolate . . R. Belgica. 



| Pseudo-raphe of greater or less breadth, but attenuate at the 



L median portion . . . . , r Surirella. 



Valve bordered with a row of beads much smaller than those in the centre 

 L of the valve . . . . . R Liburnica. 



R. amphiceros Ehr. (Bericht. der Bed. Ac, 1844; H.V.H. 

 Atl., pi. 36, f. 22 and 23*; Type No. 276), plate 10, fig. 394. 



Valve broadly lanceolate, with apices rostrate and sometimes sub- 

 capitate ; striae more or less curved, very radiant, 5 or 6 in t c.d.m., formed 

 of coarse puncta placed at equal distances and forming almost straight longi- 

 tudinal lines, the median, and sometimes those near it, shortened. Apices of 

 valve covered with irregular puncta. Mean length, 4 to 7 c.d.m. 



Marine. Common. Blankenberghe, Ostend and Antwerp (Scheldt). Coasts of England, 

 France, and Germany. 



var. rhombica Grun. (H.V.H. Atl., pi. 36, f. 20 and 21*), plate 10, 



fig- 395- 



Shorter, more inflated, with apices feebly or scarcely rostrate. Mean 

 length, 3 to 5 c.d.m. 



R. Belgica Grun. ! (in h.v.h. Atl., pi. 36, f. 25, 29 and 30*; 



Type No. 277), plate 10, fig. 396. 



Valve narrowly lanceolate or linear, with apices rostrate-obtuse or sub- 

 obtuse ; striae 7 to 9 in 1 c.d.m., straight or gently radiant, all of equal length, 

 leaving a narrow pseudo-raphe, composed of puncta forming straight longi- 

 tudinal lines. Valve with apices covered with puncta, sparse, rather fine. 

 Mean length, 8 to 9 c.d,m. 



Marine. Blankenberghe. 



R. Surirella (Ehr. ?) Grun. (H.v.h. Atl., pi. 36, f. 26 and 



27a* ; in Type No. 277), plate 10, fig. 397. 



Valve narrowly elliptic or slightly lanceolate, with apices obtuse, pseudo- 

 raphe narrow, linear, dilated only at its apices ; striae 8 in 1 c.d.m., gently 

 radiant, with coarse puncta forming longitudinal lines, more or less curved. 

 Mean length, 4 to 4*5 c.d.m. 



Marine. Common at Blankenberghe. Coast of England (Kitton). 



var. Australis. (H.V.H. Atl, pi. 36, f. 27^* ; in Type No. 277), 

 plate 10, fig. 398. 



Pseudo-raphe very broad, constricted only at the median portion. 



Marine, Blankenberghe. 



