142 



ECHINOIDEA. II. 



Sudero). The bathymetrical distribution of the species is, as far as hitherto known, from shallow water 

 to ca. 150 fathoms. 



Ech.pennatifidtim is further stated to occur in the j\Iediterraneau and at the American Coasts of 

 the Atlantic (Florida and West-Indies). The presence of the species in the Mediterranean at Tamaris- 

 sur-Mer'' was announced by Professor Koehler, who has done me the very great service to send 

 me one of these specimens. A close examination thereof, however, shows that this specimen differs in 

 several respects considerably from pc7i7iatifi.dum. — The labrum reaches to the second adjoining ambu- 

 lacral plates as in flavescens, whereas in pennatifidtovi it ends off the middle, or (in the largest speci- 

 men examined) even at the anterior end of the first ambulacral plate. Four ambulacral plates reach 

 within the subanal fasciole, which accordingly includes three pairs of pores; in pcnnatijiduin three 

 plates reach within the fasciole, with two or only one pair of pores. The periproct is like that of 

 flavescens, very different from that of pennatifiduni. The anal opening is rather eccentric, lying near 

 the upper edge, surrounded by small, irregular plates. The lower part of the anal area is bordered by 

 a series of large, regular plates, which diminish in size towards the uj^per edge; they are closely 

 covered by a fine granulation. The anal fasciole is in direct connection with the subanal fasciole, 

 whereas in pcnnafifldujn it is separated from the latter by a rather broad band of coarser tubercles, 

 as is well seen in Koehler's Fig. 10. PI. IV (Monaco); in young specimens this is, however, not the 

 case, the granulation of the two fascioles uniting in the median line. 



The number of pores in the petals differs considerably from what is found in pnuiafifidiini of 

 a corresponding size. I give here the measurements of the test and the number of pores in the petals 

 of this specimen, and, for comparison, of specimens of pci/nafifid/ii/i and flavescens of a correspon- 

 ding size. 



The internal fasciole seems to be larger than in pennatifidiiui ( — unfortunately the anterior 

 part of the test is damaged, so that I cannot state that exacth- — ); in any case it is more remote 

 posteriori}- from the apical system than in the specimen of 52'"'" length, of wliich the above measure- 

 ments are given — in the latter the fasciole passes over the second plate in the posterior interambu- 

 lacrum, in the Mediterranean specimen it passes over the 4th— 5th plate of the posterior interambula- 

 crum. The greatest width of the fasciole is 10""" in the said specimen of pennatifidum, 13""" in the 

 Mediterranean specimen; it is further to be remarked that one or two large tubefeet of the posterior 

 series of the anterior petals are within the fasciole, which is not the case in either pennatifidum or 



• Sur la presence, en M6diterran6e, de I'Asteras rubens Linne et de rEchinocardium pennatifidum Norman. Zool. 

 Anzeiger. XXI. Nr. 567. 1898. 



