NO. u;r.9. AMERfrW SU'ECfRS OF i^YXALrflEUfl—rOTJTIKRIJ. 



23 



Fig. 2. — Synalpheus paulsoni. or, 



FRONTAL AND ANTENNAL REGION ; C, 

 CARPOCERITE ; m , PORTION OF THIRD 

 FOOT. 



Lockini;ton"'s specimens came from Port Kscondido, Port jMuleoe. 

 aiul other points in the (lulf of California. Those which I ha\e 

 .studied were collected by the steamer Albatross, of the U. S. Bureau 

 of Fisheries, on the California coast at Station 4421, eastern point 

 San Nicolas Island N. 26° W. 3.8 

 miles, 229-298 fathoms. 



This species is particularly im- 

 portant because of its resemblance 

 to S. paulsoni Xobili from the Red 

 Sea and the Persian Gulf, There is 

 but one difference between the two 

 species: Tlue spine of the sca])ho- 

 cerite in S. paulsoni always exceeds 

 the carpocerite. If, however, one 

 were studying the two species with- 

 out a knowledge of their source, one 

 would be led to make of the S. 

 paulsoni an " oxyeeros " form of S, 

 loc]y'inc/toni. 



S. paulsoni^ in the group which bears its name, is a form with short 

 carpocerite, that article arising a little below the extremity of the 



basal article of the an- 

 tennule. It is a charac- 

 ter which seems to me 

 to be very essential for 

 the diagnosis of the 

 species of the group, 

 the carpocerite being- 

 elongated and slender 

 or elongated and thick, 

 and also important be- 

 cause the forms with 

 short carpocerite may 

 be considered as less de- 

 veloped, as that article 

 is always short in the 

 primitive Eucyphota. 



In the Indo-Pacific 

 region, S. paulsoni is 

 surrounded by a certain 

 number of derived forms : S. paulsoni liminaris Coutiere, in w4iich the 

 carpocerite is a little longer and the basicerite almost unarmed above; 

 S. pnnlsoni rameswarensis Coutiere, in which the interior palmar 

 border is spinous; and S. paulsoni I'urraehcensis of a more mas- 

 sive general form, very interesting, in that it indicates the direction 



a, 

 K, 



Pig. .3. — Synalpheus paulsoni kurracheensis. 



FRONTAL and ANTENNAL REGION ; C, CARPOCERITE ! 

 LARGE CHELA ; 7, FOOT OF SECOND PAIR ; TO, MEROPODITE 

 OF THIRD PAIR. 



