1907.] prom zanzibar and east africa. 451 



List of Species. 



page 



Polypus Jiorsti 451 



,, arhorescens 454 



,, horridus 454 



„ herdmani 454 



454 



E 454 



L 455 



M :.. 455 



tSepioteuthis loliginiformis 456 



S&jjia singcdensis 459 



Egg-capsules and Embiyos 459 



Polypus horsti. (Plate XX. figs. 1, 2, 3 & 12.) 

 Octopits horsti Joubin ('98) p. 23. 



Localities. — Zanzibar, shallow water at low tide, 1901 [157]. 

 Zanzibar, shore, 1-2 fathoms, eastern reefs [158, 161, 161 a]. 

 Previous record. — Djeddah, Red Sea (Joiobin). 

 The most striking character of this species is the zebra-like 

 pattern on the ventral surface of the arms shown in PL XX. 



fig- 12-. 



Specimen 158 is in very poor condition and the ocellar spots 



very faint, especially the one on the right side. 



Specimen 161 has indications of small warts (two to four) over 



each eye, instead of one large and one small one as in Joubin's 



Text-fig. 128. 



Extremity of tlie hoctocotylised arm of Polt/jpus horsti ; X 3. 



type. The ocellar spot is fairly distinct, in the best marked 

 example (161a, left side) it has a rather dark centre lOx 11 mm., 

 siirrounded by a paler ring from 2 to 4 mm. in breadth, and there 

 is a small wart in the middle of it. The size of the spot seems to 

 vary with the degree of contraction. The hectocotylised extremity 

 of the arm (text-fig. 128) measures 5 mm. from the last sucker to 

 the tip ; it is 1 "75 mm. in breadth and has a central groove 0*5 mm. 



