Chap. III. HALOCHARIS SPIRALIS. „oo 



yellow colo,. The spermatic particles (Hy. 9.) are very active at the time o"f 

 the. excl„s,o„ rany leaping the whole length of the head and tail at one bound 

 The ..ealle head ,.) i., oMong, with shghtly converging side, and about twi 

 as long as broad. From the broader end, a long, slender p.art (,). the so-called 

 t^ , ar^es and extends to the length of from eighteen to wenty tintes .1.: of 



SECTION IV. 



HALOCHARIS SPIRALIS AG. 



tube of a 'f '"*''-^,-8'<' ««>"P °f Halocharis was discovered, attached to the 



ha bor of Charleston, .South Carolina. This locality is bonnded by the open ,ea 

 ud therefore nnt., nted by the freshwater which flows into the Lrbor f^m he 

 wo rn-ers each stde of the city. The group does not appear to be compound 



the bot " r ;"'"'"' ^'•■'""' "'™= "" ' ^'-""'^ "-■ The nsnal form o 

 he body ,s a slender cyhnder (PI. 20, F!,. 10), of equal calibre from top ,„ base 

 nd cannot be s,a.d to exhibit any such distinctions, as head and ste.u, as Tre 

 en rn Coryne and Clava. It .appears heavier at the top than below/ because 

 he tentacles are successively larger as we follow the stem upwards. T e „,p 

 part sometimes becomes swollen to such an extent as to give the body a Tb 

 shaped outltne (^i,. 10'), and in this state it reminds one of Coryne. Ha^ng t 

 horny sheath, , can contract, from top to bottom, so as to become a short, alfnos" 

 globular mass (F,,. lO-), with sever.al transverse folds overlying each oti e aid 

 extendmg from the base at least half way „p the stem. wL the ten ties " 

 contracted, .also, the whole body resembles a w.«ty excrescence. The color e s I 

 ... ;..a..y other Hydroids, in the yellowish-red, grantUar lining of the chym f ron" 

 eav,^ of he body. The tentacles m,. 10, .) have different n-oportions t rdTg 

 to hen postfon; at the top they are moderately slender, round, constricted 



lasso- ells. From th,s point downwards, the tentacles gradually shorten and thus 

 are th.cker n, proportion to their length, till the lowest ones'consist Lf no, 

 but a globular mass of lasso-cells. Their arrangement along the body is in a ve": 

 marked spnal, belong.ng, apparently, to the category of i They a^-e canaHe rf 

 contractmg into a very small mass, so as to be nearly globular ^^ lO") The 

 ..outh (F,. 10^ ,.) is situated .at the extreme upper' e.d of tfl^'and 



