MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



385 



claw. (1) With resjuTl to tlu' (irst point, wi- unci witli ;i i)erteotly };iii'lui'ff<l series between I lie 

 two extremes (FIks. 1 1, 18, I'I. xxii, Fisfs. 4, IM. xxiii). (2) The same is tine of the relative lengths 

 of the antennal spines, the seale, and peduncle (Figs. 11, 13, 14, PI. xxil). In Fig. 11 there is no 

 evident scale and the spines are nearly equal. In Fig. 14 the spines are markedly unequal, and 

 there is a nidiinentary scale. In Fig. l.'J this .scale is further developed. (.S) Grca* variation is seen 

 iu the small chela. The liiigeis of this claw may each end in two or three prongs, or one in two, 

 the other in three, or the tii>s of the fingers may he simi)le or merely notched. The tuft of jiecnliar 

 seta' on the dactyle may be reduced or wanting. (4) Various stages between the long and short 

 carpus are observed, and (.">) slight variations not easily described are constantly seen iu the relative 

 size, shape, and other characters of the large chela. 



These variations are shown in a general way in Table 1. (For detailed measurement, v. Table 

 II.) The fifteen ca.ses here recorded were selected from upward of seventy-five, in a large number 

 of which the variable parts were drawn for more careful comparisons. 



TabLK I. — Showing rarintions in Alphcn.t saulcyi and the intermediate stiiges between the rarietiea 



breviearpus and lomjicarpus. 



1 



Habitat. 



Leugtl). 



Green sponge. 



...do 



Urown sponge 



Green sponge.. 



Rocks; Dix Pt. reef . 



....do 



....do 



Rocks; Hog Id. reef. 

 do 



Rocks; Green Key 

 reef. 



Brown snongo 



....do ..". 



Rocks; Di.s Pt. reef. . 



Brown sponge 



Reef rocks 



mm. 

 29.7 



42 



9 



9.5 

 17 



10.4 

 11.6 

 10 

 10 

 9.5 



17.5 



i:< 



9. 5 

 5. 5 

 11 



Aural spine. 



Extends J length 2d seg- 

 ment of antennnlar stalk 



To i 1. 2d segment 



do 



do 



i 1. 2d segment 



do 



1. of 1st segment 



Over ^ I. of 1st segment 



Nearly to end 1st segment, 

 i I. let segment 



Nearly to end Ist segment. 

 do 



i 1st segment 



do 



Nearly to end Ist segment. 



Squamona Bpine. 



Extends nearly to end of antennn- 

 lar stalk. 



Do. 



Do. 



Do. 

 Extends nearly to end of antennal 



stalk. 

 Not nearly to end of antennal stalk. 



Do. 

 }, 1. antennal stalk. 

 More than }, antennal stalk. 

 Nearly to end antennal stalk. 



^ antennal stalk. 



More than ^ antennal stalk. 



Do. 

 J 1. antennal stalk. 

 ii 1. antennal stalk. 



No. 



Inferior basal spine. 



i length sciuamous 

 spine. 



Less than il. squa- 

 mous spine. 

 ....do 



...do 



Nearly i 1. squa- 

 mous spine. 

 ....do 



\ l.H(|uan)ou8 spine, 

 jl. Hquamons spine. 



More than Jl. squa- 

 mous spi ne. 



Nearly as long as 



squanions spine. 



....do 



Sqnaiue or scale. 



Scale as long as 

 squamous spine. 

 ....do 



Scale nearly as 

 longnssquamous 

 spine. 



Scale somewhat 

 shorter than 

 squamous spine, 



Sculo not i|uite 1. 

 N(|uanious spine. 



Small and rudimen- 

 tarv. 



....do 



Rudiment 



....do 



Carpus of 



small chela. 



Short 

 ...do . 

 ...do . 



Rudiment (hardly 

 visible). 



Rudiment 



No scale 



....do 



...do 



.do 



..do . 



Long. 

 ..do . 



Short 

 Long., 



..do . 



.do 

 .do 

 .do 

 .do 



.do 



Fingers of small cbela. 



Tipssiiiiple; no tuft 



on dactyle. 

 Tipssiuple; no tuft. 



.do 



.do 



Tips simple; rudi- 

 mentary tuft. 



Prongs ; tuft oVi 

 dactyle. 



Tips simple; no tuft. 

 Prongs and tuft 



Propodns ends in 

 prongs. 



Prongs and tuft 



....do 



....do 



....do 



.do 



Remarks. 



Type of var. breviearpus. 

 V. drawing, PI. iv. 

 Claws dull red. 



Combines characters of 

 both varieties. 



V. Fig, 13, PI. XXII. 



V. Fig. 14, PI. XXII, (outer 



antenna' from above). 

 Dactyle missing. 



Claws reddish orange. 



Type of var. longicarpus. 

 Rostrum wanting. 



Clawsbrightblue; dactyle 

 of small chela extends 

 1""" beyond propodus. 



S. Mis. 94- 



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