SHALLOW-WATER STARFISHES 83 



In the Museum of Yale University there is a specimen of this 

 species collected at Monterey, Calif., which agrees very closely with 

 the type in size and structure. 



The radii are 20 mm. and 70 mm. ; ratio, 1 : 3.5. The rays are 

 shorter than in the type. The spinulation agrees in all essential 

 points with the type, though the distal dorsal spines of the rays 

 appear longer and less stout, and more of them have the clavate form. 



The wreaths of minor pedicellariae about the spines are not con- 

 spicuous, but they contain very large numbers of very minute pedi- 

 cellariae. Others of similar small size are scattered between the 

 spines or grouped in dermal clusters on or around the large papular 

 areas. The papulae are small and form large groups, above and 

 below. 



The dorsal and lateral dermal major pedicellariae are moderately 

 large and stout, ovoid or subconic, with obtuse and usually denticu- 

 lated jaws. They are not nearly so numerous nor so large as in the 

 type. Most of the actinal spines are clavate and many lack the sulcus 

 on the outside; the synactinal spines are smaller and more cylin- 

 drical; between them are large papular areas. The dorsal skeleton 

 is firm and distinctly reticulated, with a tendency to a six-rayed 

 arrangement around the principal spines, which are not so numerous 

 as in the type. 



Monterey, Calif. (R. E. C. Stearns, Mus. Yale Univ.) ; San 

 Diego (Stimpson, Ives, and others) ; San Diego (Mus. Yale Univ. 

 coll.). 



This species is closely allied to P. liitkenii. It differs especially 

 in having much fewer dorsal spines, which are also larger and more 

 distinctly capitate. The ventral (actinal) spines are more unequal, 

 stouter, shorter, and more capitate. 



PISASTER LUTKENII (Stimpson). 

 Plate XL, figures i, 2 (type). 



Asterias liitkenii STIMPSON, Proc. Boston Soc. Nat. Hist, vnr, p. 265, 1862. 

 Verrill, op. cit., 1867, p. 32. Perrier, Revis., p. 70, 1875. Bell, Genus 

 Asterias, Proc. Zool. Soc. London, 1881, p. 495. Sladen, op. cit., pp. 566, 

 824, 1889. De Loriol, Mem. Soc. Phys. et Hist. Nat., Geneve, xxxu, p. 

 15, pi. ii [xvn], figs, i-i/t, 1897 (description). 



Pisaster liitkenii VERRILL, op. cit., p. 63, 1909. 



Asterias exquiseta DE LORIOL, Rev. Zool. Suisse, 1888, p. 463, pi. xvin. fig. 2 

 (young). 



When full-grown this is one of the largest starfishes on the coast. 

 Dr. Stimpson's type was not half-grown. The following is his 

 description : 



