UIII/OSTOM.K LOBONKMA, THVSAM isTi i\IA. 



li'll 



The mucous membranes give rise to a thin copious secretion. The patient becomes hysterical, 

 coughs almost incessant Iv and throws himself about the bed, nauseated, weeping, and with an 

 anxious congested face. The pulse becomes rapid and some degree of fever usually develops. 

 The general symptoms develop in from 10 to 15 minutes after the infliction of the sting. 



The most efficient remedy was found to be a hypodermic injection of one-sixth to one- 

 eighth grain of morphine sulphate and an external application of an alkaline solution such 

 as bicarbonate of soda. A report upon these cases is presented by Dr. Old in the Philippine 

 Journal of Science, vol. 3, p. 329, 1908. 



RHIZOSTOMATA LORIFERA Vanhbffen. 



Rhizostomata lorifera, VANILLIN, 1888, Bibliotheca Zoologica, Bd. I, Heft. 3, p. 45. MAAS, 1903, ScyphomrdiiM-n der Sibopi 



Exped., Monog. n, p. 75. 

 Leptobrachida:, CLAIIS, 1883, Organisation und Entwick. Medusen, Leipzig. VON LINDENFELD, 1888, Zeit. fur wisteD.Zoo)., Bd. 



47, p. 211. MAAS, 1906, Revue Suisse de Zool., tome 14, p. 104. 



CHARACTERS OF THE GROUP. 



Rhizostomae with very elongate, narrow, lash-like mouth-arms. The lower parts ot tin 

 arms are 3-winged in cross-section, the mouths being developed upon and near the angK-s. 



The upper pans of the mouth-arms are very short and partially 

 fused to the arm-disk by a series of arches spanning from i mi- 

 arm to another. The ring-muscles of the subumlirclla are pow- 

 erfully and the radial muscles weakly developed. 



The Rhizostomata lorifera are only a subordinate group ot 

 the Rhizostomata triptera from which they have been demed In 

 the elongation of the mouth-arms and the reduction of the lati-i al 

 expansions of the arms. A description of the genera follows: 



Thyianosloma L. AGASSIZ, 1862. Mouth-arms without terminal clubs. 3 rows 

 of frilled mouths extend down the angles throughout the entire length of 

 the lower arm. 



Lorifcra HAECKEL, 1880. Similar to Thysanmtoma but with a naked knob 

 at the lower end of each arm. 



I^plobrachia BRANDT, i%i&= Leptobrachia+ Ltonura HA ECKEL. Mouths confinc.l 

 to the lower and upper ends of the mouth-arms, so that the mouth-. i' 

 devoid of mouths in the mid-regions of their lengths. 



Genus THYSANOSTOMA L. Agassiz, 1862. 



Thysanostoma, AGASSIZ, L., 1862, Cont. Nat. Hist. I'.S., vol. 4, p. r ^,. HM<KM, 1880, 

 Syst.der Medusen, p. 615. VAN BOFFIN, iSSS. Bibliotheca Zoologica, Bd. I, Heft. 

 FIG. 419. Diagrammatic representa- 3, p. 45. KISIUNOI-YE, 1895, Zool. Magazine, Tokyo, vol. 7, p. 133.-- Si m i 1/1 , 



lion of the form and position 1898, Dcnkschr. Med. Nat. Gescll., Jena, Bd. 8, p. 44*. MAAS, 1903, Scypho- 



of the mouth-arms in the Rhi- mcdusen der Siboga Exped., Monog. 1 1 , pp. 75, 8 I ; njo<>, Revue Suisse de Zool., 



zoslomata lorifera, tome 14, p. 105. 



The type species is Thysanostomn thysanura from the Indo-Pacific region. It is possible 

 that Lesson's inadequately described Rliizostoma brachyura may be the same medusa. 



GENERIC CHARACTERS. 



Rhizostomata lorifera having mouth-arms bearing 3 rows of frilled mouths from base to 

 lower end, without a terminal club. 



Among characters of minor importance, the 4 intci radial, suhgenital ostia are wider than 

 the perradial columns between them. There are 8 rhopalar canals, and a ring-canal whii li 

 gives off a network of vessels on both its inner and outer sides. This network connects \\itli 

 all the radial-canals and also at numerous points with the central stomach. The well-de\ el- 

 oped circular muscles are only partially interrupted in the X principal radii. 1 here is a small, 

 shallow, exumbrella pit above each sense-organ, without furrows in the floor of the pit. 



