553 



Araukta Pass Aleutian Islands, 283 fathoms. Bottom, black sand. 



C. validiis differs from C. rudis Verrill in having a definite tumid 

 naked area on upper surface of each superomarginal, abactinal pedicel- 

 lariae, very unequal actinal intermediate granules of larger size , larger 

 actinal pedicellariae, and relatively to the abactinal granules, larger 

 granules on lateral face of marginals. C. rudis has more difinite rays 

 the last 4 marginals being in contact medially, but this may vary with 

 age (2 superomarginals in contact in validus). 



Hippasteria leiopelta new species. 



General form stellato-pentagonal to arcuate pentagonal , the latter 

 being usual for small specimens which have R, about 1,45 r while larger 

 examples have R 1,5 r. Some have the radii as 1,7 : 1. Abactinal plates 

 smooth in the middle surrounded by a single series of granules, and 

 bearing besides occasionally a central granule, rarely a tubercle, 

 and (interradially) here and there a large low bivalved pedicellariae. 

 Marginal plates regular, large, dorsally and ventrally naked, except for 

 a peripheral series of granules; a cluster of granules with sometimes a 

 spine or tubercle on outer face; no marginal pedicellariae; scattered 

 large bivalved actinal pedicellariae; actinal granules large, adambula- 

 cral spines 2, large and davate in a transverse row on plate, the single 

 furrow spine slightly the larger. R 30 mm; r 20 mm; r 1,5 r. 



Off Kamchatka (52" 46' 50" N. Lat, 158° 44' 30"E. Long.) 69 to 

 48 fathoms. Bottom, green sand. 



This small, well-marked species differs from phrygiana and allies 

 in the absence of abactinal spines or tubercles, the central portion of 

 plates being usually smooth and bare, except for an occasional granule 

 or pedicellaria. Likewise the marginal plates lack the characteristic 

 spines of phrygiana although spines may be present on the lateral 

 surface of the plates. The greater part of the surface of the marginals 

 is entirely bare. The adambulacral spines are heavy and reduced to 2 

 forming a transverse series. 



2. Parametabolie und Neotenie bei Cocciden. 



Von Carl Borner. 

 Aus der Kaiserlichen Biologischen Anstalt für Land- und Forstwirtschaft.) 



(Mit 8 Figuren.) 



eingeg. 8. Februar 1910. 



Li meiner vergleichenden Studie über die Verwandlungen der In- 

 sekten 1 habe ich den Nachweis führen können, daß die postembryonale 



1 Die Verwandlungen der Insekten (vorl. Mitteilung). Sitzber. nat. Freunde, 

 Berlin, 1909. S. 290-311. 



