THK SKRirLARID-S. 135 



\vliicli bears a pair of branches on its distal mil. below which arc one or two pairs of bydrothecse. 

 Branches opposite, with a const rid ion al ihcir origin. di\ ided into regular internodcs. each of 

 which hears a pair ol' bydrotheCffl near its distal end. 1 1 ydrotlici-c opposite. IOHL:'. tubular. i-ej.ni- 

 lai-ly ciirvril so as to form nearly a quadrant of a circle: margin round, llaring. often several 

 time- reduplicated, in some cases with i[iiite constantly a single reduplication, a- described b\ 

 Allinan. Operculum not evident. 



(inn i>s,n,,,. - (ionanjria springing from the lumen of hydrotheca. oblong-oval. annulated 

 throughout. When examining the type specimens in the Museum of Comparative /oology the 

 writer found one specimen in which tin- gonaiigium was growing I'roni the hydro! heca. and uas 

 of characteristic x///////< ////// type. 



AV/v7,,,,//,,/,.-Tortiigas. is fathoms (. Mlman): .!//<,///,* Station i':!LI. lat. N. :',-2 55', Ion--. 

 W. 77 54'. 7'.i fathoms: Station 2331, lat N. L':; In' :',!". long. \\ . >i' I'- 1 ' ''"'". 114 fathoms: 

 Station i'41n, lat. N. _'() 47' J'.u". long. \Y. ,s:i 25' L5", -'* fathom-: Station -_'41".. lat. N. *> . long. 

 W. M.' 57' 30", -'4 fathoms; Station L'414. lat. N. i':. ti4' 30", l.m.ir. \V. s_' :.!' l.V, L'f, fath<.nis. 



Ott' Harliados. 7i fatl ..... is (Fewkes). 



Tin- presonce of pairs of hydrotheca' on the stem .-eeins to lie the lie,-t character liy which 

 this species can lie separated from .V. /-,,////,,. 



TI/JH. In the .Museum of Comparative Zoology, Cambridge, Massachusetts. 



SYNTHECIUM RECTUM, new species. 



( Plate X I.I. !!_'. 1'. i 



Tropkosorne. Colony consistinu' of a monosiplionic stem, with strictly opposite branches 

 attaining a height of aliout three fourths of an inch. Stem straiu'ht. tubular, exceedingly 

 transparent, with distant and irregular nudes, or none. Uranches opposite, oriifiiuiting from a 

 tubular process of the stem, from which a branch springs like a section of a telescope. This 

 feature, however, i- not constant. Brandies divided into regular internode-. each of which bears 

 a pair of hydrothecse on its distal half and does not become noticcablv attenuate near its proximal 

 end, branches in many cases forming a riirht anjj-le with the stem from which they spring. Ilydro- 

 tlicca- I u l ilar. cylindrical, regularly curved throiiLi'li a quadrant of a circle, the aperture opening 

 di'-ectly outward, not contingent in front, free- for more than their distal half; margin entire. 

 sometimes slightly everted, and usually with a distinct narrow rim: no operculnm. There are no 

 hydrotheca 1 on the branch-bearing portion of the stem. 



(riHiiixnni, . Not known. 



Distribution. T)redged near Habana. Cuba, by the Bahama Kxpedition from the State 

 I'lmer-itv of Iowa: . !/////v.v Station iMlii, lat. N. Ml i'f,'. long. W. 77 o7'. L'7i! fathoms. 



This species has been compared \\ ith Allman's tvpe of X ////< ///</ tubitlieca in the .Mu-eum of 

 ('omparative Xoolo^-v and found to be quite distinct. l>cin- much more trail-parent in structure 

 and not having jiair- of h vdrotlieea- rej;-ularlv distributed on the stem. 



Tijj>. slides. Cat. No. l'.7i:>. l".S.N..M. Cat. N.>. lM',71. .Museum of the State 1'iiiver-ity of 

 Iowa: also in the collection of tin 1 author. 



? SYNTHECIUM MARGINATUM (Allman). 

 (Plate XI. I, liir. ::. ) 



:\l-/ll/in-iil llllll-llilllllil Al.I.M\\. MlMll. Mils. C..lli|,. /i ml.. V. N'n. L', 1 S77. p. -'.',. 



" Ti'iiji/K'xoiin . Ilydrocaiilu- attaining a height of aliout an inch, simple: internodes elon- 

 gated, attenuated below every pair of hydrotheea-. llydrothec.e o]iposite. dee]), tubular, free 

 and divergent above for about three-tifth- of their height, slightly tumid below, orifice entire, 



with a broad rim formed by close st ri:e. \\ Inch run in a circular direction round the di-tal end of 

 the hydrothec.-e." 



I i, miixinii, . Not known. 



IHxti ;/,/;,,. Oil Florida IJeef. :'.L'4 fathoms (Allman). 



