152 



ECHINOIDEA. II. 



Analytical table of the Echinocardium species. 



1. Anterior ambulacrum deepened 2. 



not deepened, flush with the test 3. 



2. The furrow continuing to the apical system; the pores within the internal 

 fasciole in close, double series. Larger tubercles are found scattered on the 

 anterior inter ambulacra above the ambitus 



r cordatum. 



\ taustrale). 

 The furrow ending abruptly at the anterior end of the internal fasciole; 



the pores within this fasciole distant and in single series. No larger tubercles 



above the ambitus mcditerraneum. 



3. No larger primary tubercles in the interambulacra above the ambitus; the 

 labrum very short, not reaching beyond the middle of the first adjoining 



ambulacral plates pennatifidum. 



Larger primary tubercles are found at least in the anterior iuterambulacra 



above the ambitus; the labrum generally reaching the second adjoining 

 ambulacral plates ^ 4. 



4. Very prominent primary tubercles in all the interambulacra above the am- 

 bitus flavescens. 



\ 



The primary tubercles above the ambitus little prominent, and occurring, 

 only in the anterior interambulacra 5. 



5. Internal fasciole very small; a distinct saddle-shaped depression in the apical 



region capense. . 



Internal fasciole large; no saddle-shaped depression in the apical region . . intermedium. 



33. Brissopsis lyrifera (Forbes). 



PI. III. Figs. 23, 7, n 12, 18, 2023. PL IV. Figs. 23, 9, 14-17. PI. XVIII. Figs, i, 6, 12, 18, 2526. PI. XIX. Figs. 3, 6, 10, 



15, 1821, 29, 34. 



Synonyms: Schizaster incertus Aradas. 

 Brissus pulvinatus Phil. 

 Brissopsis parma Val. 



Principal literature: Forbes: British Starfishes. 1841. p. 187. -- Diiben & Koren: Skandinav. 

 Echinodermer. p. 280. Tab. X. 46. -- Philippi: Beschreibung einiger neuen Echinod. Arch. f. Naturg- 

 1845. P- 347- ~~ L. Agassiz & Desor: Catalogue raisonne. p. 121. PI. XVI. 12. -- Sars: Norges Echi- 

 nodermer. p. 96. -- A. Agassiz: Revision of Echini, p. 95, 354. PI. XIX. Figs, i 8 (non Fig. 9), XXI. 

 Figs, i 2, XXXVIII. 36 38. -- Perrier: Recherch. s. les pedicell. p. 173. PI. VII. 9. -- Loven: Etudes 

 s. les Echinoidees. PI. I. i, 11.2731, 111.32, XII. 100-101, XXXVII. 213-18. On Pourtalesia. PI. VIII. 

 66, IX, XIX. 223 31. - Wyv. Thomson: Porcupine: -Echinoidea. p. 750. - - A. Agassiz: Chal- 

 lengers-Echinoidea. p. 189. -- Koehler: Recherches s. les Echinoidees des cotes de Provence, p. 135. 

 Meissner & Collin: Beitr. z. Fauna d. sudost. u. 6'stl. Nordsee. II. Echinodermen. p. 334. (Figure.) 

 - Ludwig: Echinodermen d. Mittelmeeres. p. 562. - Bell: Catalogue Brit. Echinoderms. p. 172. - 



