AsTiKiUKi: A <>i NORTH PACIFK IND Atu\. ivi WATERS P1SHSB B3 



differenl habitat, ii is ool precisely like the type, [ta dimensions are: R 86 mm., 

 r 18 mm., E 1.7 r; breadth <>f ray at the widest part, jnst beyond base, 19 mm. The 

 rays are ool bo inflated as in either the type or apecimen A. and there is do cone above 

 the Buperomarginals of conspicuous width al the base of raj free from >|mh<-- The 



tins] spine- are typical in form and arrangement and are relatively about the 

 size <>f those of the cotype, and a t i-i f li- larger than those of the type The supero- 

 marginal spines are stouter and s little longer than the adjacent abactinal -pine-. 

 whereas in the type and cotype 1 1 1 « - adjacent abactinal ^i>im- are a trifle heavier. 



The <li-tal Buperomarginals bear a transverse series of thr< r two spines, which is 



typical, ami occasionally a proximal plate carries an extra Bpine, it b group of three 

 smaller s|iitn~ The intermarginal channel is oarrower, as is also that below the 

 inferomarginaj spines The actinal plates are in two series and the spines are a little 

 thicker than the inferomarginals, clavate and obtuse or pinched at the tip. A few 

 of the plate- bear a group of three or four smaller -pines in place "f the Bingle aormal 

 spine. 



Professor Yen-ill writes: "The adambulacral Bpines are unusually numerous, 



crowded in three Or more rOWB. The\ stand mostly tWO OH a plate, lint often there 



are thr >n part of the plates, or alternately two and three" (1914, p. 113) This 



i- misleading since plates with three Bpines occur very rarely. After considerable 

 ch 1 found one <>n the cuter third of the ray, and the third spine is small and 



interpolated between the two PBgulaX -pine-. The mistake probahlv arose from 



counting the spines of two consecutive plates, since th«- armature is crowded Taking 

 at random one furrow margin and commencing with the first plate, the -pine- per 



plate lire a- follows: five with one Bpine, then eight with two. then 1 '2 1 2 2 1 2 1 2 I 



2 2 l ■-' 'J •-' l 'J -' '-' l '-' i' l 2 2 2 l '2 l '.' i -' l '-' l '-' 1 J 'J '-' '-' 1 '-' l '-': then 32 [dates 

 with alternately 2 and l ; then -A i 2 l •_' Jill '-'. etc 



The adambulacral spines are therefore normal for the Bpecies The mouth 

 plate- maj have a second -mall -pine on the act mostoinial margin adjacent to median 

 suture. 



The pedicellariae, both straight and crossed, are like those of the type in form 

 .•mil are similarly distributed. The abactinal crossed pedicellariae are about < 

 mm. long while the Btraight are usuallj 2 or 2 5 times as long The latter are 

 numerous, and the largest about 65 nun in length are found laterally near the base 

 of the ray The abactinal pedicellariae are figured. (Fl. 33, figs 2,6 The crossed 



pedicellariae -eein to have n few more teeth than in the typical form. 



LeptaeterUu p. lcaiherintu ms destined to cause confusion. Yerrill (1914, p. 



112) describes a ml figures tin- specimen, No l i^l . a- .1 leaih* Irute, hut later in the 

 same work, p. 17n, records it as Ortiia '• a and figures (pi. 7.">. figs l Id) 



the dorsal, marginal, and adambulacral Bpines, a- of msmanri, The specimen >- not 



taint, however. I Buspect there i- a mistake iii this plate Figure l. ". i>, and <\ 

 and Figure Ic do not represent typical ordinary dorsal apini ■ 1181 and would 



tainly mislead anyone attempting to use the figure for kiii!' The typical 



dorsal spines are similar to those figured in tin- work (pi 33, iii: \f), I 

 clavate to subcapitate and grooved at the tip. They do not caiTj Btraight pedicel- 

 lariae on the aides, a- shown in Verrill's Plate ;."., Figures l. </. b. 



